From Wikipedia, the free encyclopedia
|
|
| Appearance |
metallic yellow
 |
| General properties |
| Name, symbol, number |
gold, Au, 79 |
| Element category |
transition metal |
| Group, period, block |
11, 6, d |
| Standard atomic weight |
196.966569(4) g·mol−1 |
| Electron configuration |
[Xe] 4f14 5d10 6s1 |
| Electrons per shell |
2, 8, 18, 32, 18, 1 (Image) |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
19.30 g·cm−3 |
| Liquid density at m.p. |
17.31 g·cm−3 |
| Melting point |
1337.33 K, 1064.18 °C, 1947.52 °F |
| Boiling point |
3129 K, 2856 °C, 5173 °F |
| Heat of fusion |
12.55 kJ·mol−1 |
| Heat of vaporization |
324 kJ·mol−1 |
| Specific heat capacity |
(25 °C) 25.418 J·mol−1·K−1 |
| Vapor pressure |
| P/Pa |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T/K |
1646 |
1814 |
2021 |
2281 |
2620 |
3078 |
|
| Atomic properties |
| Oxidation states |
-1, 1, 2, 3, 4, 5
(amphoteric oxide) |
| Electronegativity |
2.54 (Pauling scale) |
| Ionization energies |
1st: 890.1 kJ·mol−1 |
| 2nd: 1980 kJ·mol−1 |
| Atomic radius |
144 pm |
| Covalent radius |
136±6 pm |
| Van der Waals radius |
166 pm |
| Miscellanea |
| Crystal structure |
Lattice face centered cubic |
| Magnetic ordering |
diamagnetic |
| Electrical resistivity |
(20 °C) 22.14 nΩ·m |
| Thermal conductivity |
(300 K) 318 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 14.2 µm·m−1·K−1 |
| Speed of sound (thin rod) |
(r.t.) 2030 m·s−1 |
| Tensile strength |
120 MPa |
| Shear modulus |
27 GPa |
| Bulk modulus |
180 GPa |
| Poisson ratio |
0.44 |
| Mohs hardness |
2.5 |
| Vickers hardness |
216 MPa |
| Brinell hardness |
25 HB MPa |
| CAS registry number |
7440-57-5 |
| Most stable isotopes |
| Main article: Isotopes of gold |
|
|
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.^ All media elements have an associated error status, which records the last error the element encountered since its resource selection algorithm was last invoked.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Since I'm a running shoes and beer type barfly, I felt a bit out of my element the other night on King West.- Alltop - Top Canada News 10 February 2010 12:55 UTC canada.alltop.com [Source type: General]
The metal occurs as
nuggets or grains in rocks, in
veins and in
alluvial deposits. Gold is dense, soft, shiny and the most
malleable and ductile pure metal known. Pure gold has a bright yellow color and luster traditionally considered attractive, which it maintains without oxidizing in air or water. Gold is one of the
coinage metals and has served as a symbol of wealth and a
store of value throughout history.
Gold standards have provided a basis for monetary policies. It also has been linked to a variety of symbolisms and ideologies.
.^ This could be an actual variable in a mathematical expression or programming context, or it could just be a term used as a placeholder in prose.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ If you’re a wealthy U.S. citizen or a Canadian who owns property in the United States, 2010 may be the ideal year to die.- Alltop - Top Canada News 10 February 2010 12:55 UTC canada.alltop.com [Source type: General]
^ For example, the back button could have a drop down showing just the pages in the session history, and not showing any of the states.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
.^ It is used to treat many conditions, including inflammation, allergies, and some cancers.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ A button (and its value) is only included in the form submission if the button itself was used to initiate the form submission.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
Gold has traditionally found use because of its good resistance to
oxidative corrosion and excellent quality as a conductor of electricity.
.^ A procedure that uses gold salts (a salt form of the metal element gold) to treat diseases, such as rheumatoid arthritis.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
.^ A procedure that uses gold salts (a salt form of the metal element gold) to treat diseases, such as rheumatoid arthritis.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
Gold dissolves in
mercury, forming
amalgam alloys, but does not react with it. Gold is insoluble in
nitric acid, which dissolves
silver and
base metals.
.^ The term MIME type is used to refer to what is sometimes called an Internet media type in protocol literature.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ This specification uses the term document to refer to any use of HTML, ranging from short static documents to long essays or reports with rich multimedia, as well as to fully-fledged interactive applications.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ The term "HTML5 validator" can be used to refer to a conformance checker that itself conforms to the applicable requirements of this specification.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
Characteristics
Gold is the most
malleable and
ductile of all metals; a single
gram can be beaten into a sheet of 1 square meter, or an
ounce into 300 square feet. Gold leaf can be beaten thin enough to become translucent. The transmitted light appears greenish blue, because gold strongly reflects yellow and red.
[2] .^ A system in which medical doctors and other healthcare professionals (such as nurses, pharmacists, and therapists) treat symptoms and diseases using drugs, radiation, or surgery.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ Thus, while it is possible to track users without this feature, authors are encouraged to use the ping attribute so that the user agent can make the user experience more transparent.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ A type of external radiation therapy that uses a special machine to make invisible, high-energy particles (protons or helium ions) that kill cancer cells.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
[3]
.^ Used as bulk metal and in lightweight alloys with magnesium for engines, also as a sacrificial electrode to protect other metals.- Mineral Species sorted by the element Mg Magnesium 16 January 2010 3:03 UTC webmineral.com [Source type: Reference]
.^ Once a gradient has been created (see below), stops are placed along it to define how the colors are distributed along the gradient.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ The other arguments are specific to the type, and control the way that the image is generated, as given in the table below.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Here we see an item with two properties, "favorite-color" and "favorite-fruit", both set to the value "orange": .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
.^ Infrared Radiant Heating Elements .- Titanium Information and Resources 9 January 2010 0:56 UTC www.titanium.cc [Source type: Reference]
- Aluminum Suppliers Information and Resources 10 February 2010 11:10 UTC www.aluminumsuppliers.net [Source type: Reference]
^ Electric Infrared Radiant Heaters .- Titanium Information and Resources 9 January 2010 0:56 UTC www.titanium.cc [Source type: Reference]
- Aluminum Suppliers Information and Resources 10 February 2010 11:10 UTC www.aluminumsuppliers.net [Source type: Reference]
.^ Used as bulk metal and in lightweight alloys with magnesium for engines, also as a sacrificial electrode to protect other metals.- Mineral Species sorted by the element Mg Magnesium 16 January 2010 3:03 UTC webmineral.com [Source type: Reference]
^ The b element should be used as a last resort when no other element is more appropriate.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ The lang attribute in the XML namespace may be used on HTML elements in XML documents , as well as elements in other namespaces if the relevant specifications allow it (in particular, MathML and SVG allow lang attributes in the XML namespace to be specified on their elements).- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
However, it is not chemically inert.
Common
oxidation states of gold include +1 (gold(I) or aurous compounds) and +3 (gold(III) or auric compounds).
.^ The use of drugs, vitamins, or other agents to try to reduce the risk of, or delay the development or recurrence of, cancer.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
The added metal is
oxidized and dissolves allowing the gold to be displaced from solution and be recovered as a solid precipitate.
High quality pure metallic gold is tasteless; in keeping with its resistance to corrosion (it is metal ions which confer taste to metals).
In addition, gold is very dense, a cubic meter weighing 19,300
kg. By comparison, the density of
lead is 11,340 kg/m
3, and that of the densest element,
osmium, is 22,610 kg/m
3.
Color
Different colors of Ag-Au-Cu alloys
Whereas most other pure metals are gray or silvery white, gold is yellow.
.^ Status: Last call for comments The a , area , and link elements can, in certain situations described in the definitions of those elements, represent hyperlinks .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
The frequency of these oscillations lies in the ultraviolet range for most metals, but it falls into the visible range for gold due to subtle
relativistic effects that affect the
orbitals around gold atoms.
[4][5]
.^ Three constructors are provided for creating HTMLImageElement objects (in addition to the factory methods from DOM Core such as createElement() ): Image() , Image( width ) , and Image( width , height ) .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Two constructors are provided for creating HTMLAudioElement objects (in addition to the factory methods from DOM Core such as createElement() ): Audio() and Audio( src ) .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Several constructors are provided for creating HTMLOptionElement objects (in addition to the factory methods from DOM Core such as createElement() ): Option() , Option( text ) , Option( text , value ) , Option( text , value , defaultSelected ) , and Option( text , value , defaultSelected , selected ) .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
.^ We also distribute stainless steel, aluminum and nickel alloys in these forms.- Titanium Information and Resources 9 January 2010 0:56 UTC www.titanium.cc [Source type: Reference]
.^ Glass blowers Didymium Safety Glasses may be used to block out this emission to observe the less intense colors from other elements.- Mineral Species sorted by the element Na Sodium 6 January 2010 8:54 UTC webmineral.com [Source type: FILTERED WITH BAYES]
[6]
Isotopes
.^ Naturally Occurring Isotopes .- Mineral Species sorted by the element Na Sodium 6 January 2010 8:54 UTC webmineral.com [Source type: FILTERED WITH BAYES]
36
radioisotopes have been synthesized ranging in
atomic mass from 169 to 205. The most stable of these is
195Au with a
half-life of 186.1 days.
195Au is also the only gold isotope to decay by
electron capture. The least stable is
171Au, which decays by
proton emission with a half-life of 30 µs. Most of gold's radioisotopes with atomic masses below 197 decay by some combination of
proton emission,
α decay, and
β+ decay. The exceptions are
195Au, which decays by electron capture, and
196Au, which has a minor
β- decay path. All of gold's radioisotopes with atomic masses above 197 decay by β- decay.
[7]
At least 32
nuclear isomers have also been characterized, ranging in atomic mass from 170 to 200. Within that range, only
178Au,
180Au,
181Au,
182Au, and
188Au do not have isomers. Gold's most stable isomer is
198 m2Au with a half-life of 2.27 days. Gold's least stable isomer is
177 m2Au with a half-life of only 7 ns.
184 m1Au has three decay paths: β+ decay,
isomeric transition, and alpha decay. No other isomer or isotope of gold has three decay paths.
[7]
Use and applications
Monetary exchange
.^ Used as bulk metal and in lightweight alloys with magnesium for engines, also as a sacrificial electrode to protect other metals.- Mineral Species sorted by the element Mg Magnesium 16 January 2010 3:03 UTC webmineral.com [Source type: Reference]
^ On setting, the given value must be converted to the shortest possible string representing the number as a valid non-negative integer and then that string must be used as the new content attribute value.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ The World Wide Web's markup language has always been HTML. HTML was primarily designed as a language for semantically describing scientific documents, although its general design and adaptations over the years have enabled it to be used to describe a number of other types of documents.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
However, the amount of gold in the world is finite and production has not grown in relation to the world's economies. Today,
gold mining output is declining.
[8] .^ This is complicated by the manner in which the Gregorian calendar was phased in, which occurred at different times in different countries, ranging from partway through the 16th century all the way to early in the 20th.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
At the beginning of
World War I the warring nations moved to a fractional gold standard, inflating their currencies to finance the war effort. After
World War II gold was replaced by a system of
convertible currency following the
Bretton Woods system. Gold standards and the direct convertibility of currencies to gold have been abandoned by world governments, being replaced by
fiat currency in their stead.
.^ The input element's type attribute is changed back to the Image Button state, and the src attribute is present, and its value has changed since the last time the type attribute was in the Image Button state.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
[9]
.^ The integrity of this API is based on the inability for scripts of one origin to post arbitrary events (using dispatchEvent() or otherwise) to objects in other origins (those that are not the same ).- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Contexts in which this element may be used: In a head element containing no other base elements.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Each unit of related similar-origin browsing contexts can have a first script which is used to obtain, amongst other things, the script's base URL to resolve relative URLs used in scripts running in that unit of related similar-origin browsing contexts .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
The gold content of alloys is measured in
carats (k). Pure gold is designated as 24k. Gold coins intended for circulation from 1526 into the 1930s were typically a standard 22k alloy called
crown gold, for hardness.
Investment
Many holders of gold store it in form of bullion coins or
bars as a hedge against
inflation or other economic disruptions. However, some economists do not believe gold serves as a hedge against inflation or currency depreciation.
[10]
.^ The JavaScript specification requires that the ToBoolean() operator convert all objects to the true value, and does not have provisions for objects acting as if they were undefined for the purposes of certain operators.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
The
special issue Canadian Gold Maple Leaf coin contains the highest purity gold of any
bullion coin, at 99.999% or .99999 finess, while the
popular issue Canadian Gold Maple Leaf coin has a purity of 99.99%. Several other 99.99% pure gold coins are available. The Australian Gold Kangaroos was first coined in 1986 as the
Australian Gold Nugget.
.^ In addition, there are some restrictions on how character encoding declarations are to be serialized, as discussed in the section on that topic.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
.^ The products that are available in the United States may not contain the same amount or mixture of ingredients and may not be effective.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
Jewelry
.^ Used as bulk metal and in lightweight alloys with magnesium for engines, also as a sacrificial electrode to protect other metals.- Mineral Species sorted by the element Mg Magnesium 16 January 2010 3:03 UTC webmineral.com [Source type: Reference]
^ Each unit of related similar-origin browsing contexts can have a first script which is used to obtain, amongst other things, the script's base URL to resolve relative URLs used in scripts running in that unit of related similar-origin browsing contexts .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ The integrity of this API is based on the inability for scripts of one origin to post arbitrary events (using dispatchEvent() or otherwise) to objects in other origins (those that are not the same ).- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
.^ A series of x-ray pictures of the esophagus taken after a patient drinks a liquid containing barium sulfate (a form of the silver-white metallic element barium).- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
.^ Similarly, the MIME type used to refer to JavaScript in this specification is text/javascript , since that is the most commonly used type, despite it being an officially obsoleted type according to RFC 4329.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
Eighteen carat gold containing 25% copper is found in antique and Russian jewelry and has a distinct, though not dominant, copper cast, creating
rose gold.
.^ Glass blowers Didymium Safety Glasses may be used to block out this emission to observe the less intense colors from other elements.- Mineral Species sorted by the element Na Sodium 6 January 2010 8:54 UTC webmineral.com [Source type: FILTERED WITH BAYES]
^ Contrast material may be used with x-rays, CT scans, MRI, or other imaging tests.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ This process may be used to kill certain types of small tumors or to seal off blood vessels to stop bleeding.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
Blue gold can be made by alloying with
iron and purple gold can be made by alloying with
aluminium, although rarely done except in specialized jewelry.
.^ However, with other alternative text, this might not work, and putting all the alternative text into one image in each case might make more sense: .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Not providing replacement text makes the document more difficult to use for people who are unable to view images, e.g.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
Fourteen and eighteen carat gold alloys with silver alone appear greenish-yellow and are referred to as green gold. White gold alloys can be made with
palladium or
nickel.
.^ We offer aluminum alloys with zinc, copper, magnesium, nickel, iron and more.
Nickel is toxic, however, and its release from nickel white gold is controlled by legislation in Europe.
.^ Their futures, and those of their families, have been forever altered — almost uniformly for the worse — for nothing more criminal than being a Nortel employee and believing in a company pension .- Alltop - Top Canada News 10 February 2010 12:55 UTC canada.alltop.com [Source type: General]
^ We offer aluminum alloys with zinc, copper, magnesium, nickel, iron and more.
^ A spokesperson at the CES released a press preview event on Tuesday night and explained that by using lasers for the source of the light Microvision can guarantee better focus and more brilliant colors than other technologies.- Alltop - Top Canada News 10 February 2010 12:55 UTC canada.alltop.com [Source type: General]
.^ The following, however, is incorrect usage, as the cite element here is containing far more than the title of the work: .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ If the navigation algorithm has so far contacted more than one origin If there is no source browsing context The value must be the string " null ".- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
The Japanese craft of
Mokume-gane exploits the color contrasts between laminated colored gold alloys to produce decorative wood-grain effects.
Medicine
- In medieval times, gold was often seen as beneficial for the health, in the belief that something that rare and beautiful could not be anything but healthy. .^ A procedure that uses gold salts (a salt form of the metal element gold) to treat diseases, such as rheumatoid arthritis.
- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
[11] .^ Its extract is used with other treatments in some cultures to treat cancer and other conditions.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ It is also being studied in the treatment of other types of cancer and other conditions.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ It is also used to treat metastatic breast cancer that has not improved after treatment with certain other anticancer drugs.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
[12] .
- In modern times, injectable gold has been proven to help to reduce the pain and swelling of rheumatoid arthritis and tuberculosis.^ If the element is a time element with a datetime attribute The value is the value of the element's datetime attribute.
- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ When the element is suffering from a step mismatch , the user agent may round the element's value to the nearest local date and time for which the element would not suffer from a step mismatch .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ The classes that an HTML element has assigned to it consists of all the classes returned when the value of the class attribute is split on spaces .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
[12][13]
.
- Dentistry. Gold alloys are used in restorative dentistry, especially in tooth restorations, such as crowns and permanent bridges.^ A procedure that uses gold salts (a salt form of the metal element gold) to treat diseases, such as rheumatoid arthritis.
- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
.^ Their futures, and those of their families, have been forever altered — almost uniformly for the worse — for nothing more criminal than being a Nortel employee and believing in a company pension .- Alltop - Top Canada News 10 February 2010 12:55 UTC canada.alltop.com [Source type: General]
^ Starbucks) by visiting it more often than other Foursquare users.- Alltop - Top Canada News 10 February 2010 12:55 UTC canada.alltop.com [Source type: General]
^ Constraint validation : When the element has a maximum , and the result of applying the algorithm to convert a string to a number to the string given by the element's value is a number, and the number obtained from that algorithm is more than the maximum , the element is suffering from an overflow .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
.
- Colloidal gold preparations (suspensions of gold nanoparticles) in water are intensely red-colored, and can be made with tightly controlled particle sizes up to a few tens of nanometers across by reduction of gold chloride with citrate or ascorbate ions.^ A spokesperson at the CES released a press preview event on Tuesday night and explained that by using lasers for the source of the light Microvision can guarantee better focus and more brilliant colors than other technologies.
- Alltop - Top Canada News 10 February 2010 12:55 UTC canada.alltop.com [Source type: General]
^ A drug used to treat acute leukemias and some other types of cancer.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ A substance made in the muscle and liver tissue and found in certain foods, such as meat, poultry, fish, and some dairy products.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
Colloidal gold is used in research applications in medicine, biology and materials science. .^ Colloidal gold-bound tumor necrosis factor is made in the laboratory by binding a cancer-killing protein called tumor necrosis factor (TNF) to the surface of very tiny particles of gold.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
Colloidal gold particles coated with specific antibodies can be used as probes for the presence and position of antigens on the surfaces of cells (Faulk and Taylor 1979). In ultrathin sections of tissues viewed by electron microscopy, the immunogold labels appear as extremely dense round spots at the position of the antigen (Roth et al. 1980). .
- Gold, or alloys of gold and palladium, are applied as conductive coating to biological specimens and other non-conducting materials such as plastics and glass to be viewed in a scanning electron microscope.^ Otherwise, apply the rules for choosing a browsing context given a browsing context name using target as the name and the browsing context of form as the context in which the algorithm is executed; the resulting browsing context is the target browsing context.
- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ The microdata becomes even more useful when scripts can use it to expose information to the user, for example offering it in a form that can be used by other applications.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ When such restrictions are defined, the tokens must all fit within those restrictions; other values are non-conforming.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
The coating, which is usually applied by sputtering with an argon plasma, has a triple role in this application. Gold's very high electrical conductivity drains electrical charge to earth, and its very high density provides stopping power for electrons in the electron beam, helping to limit the depth to which the electron beam penetrates the specimen. This improves definition of the position and topography of the specimen surface and increases the spatial resolution of the image. .
- The isotope gold-198, (half-life: 2.7 days) is used in some cancer treatments and for treating other diseases.^ A drug used to treat cancer.
- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ A quality of some drugs used in cancer treatment.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ A drug used to treat acute leukemias and some other types of cancer.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
[14]
Food and drink
.^ It can also be made in the laboratory, and is added to some soft drinks, foods, and medicines.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ However, a decorative image that isn't discussed by the surrounding text still has some relevance can be included in a page using the img element.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Some states define an algorithm to convert a string to a number , an algorithm to convert a number to a string , an algorithm to convert a string to a Date object , and an algorithm to convert a Date object to a string , which are used by max , min , step , valueAsDate , valueAsNumber , stepDown() , and stepUp() .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
[16] .^ The value of the fn property must be a name in one of the following forms: .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ The value must be text with one of the following values: .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ On setting, the given value must be converted to the shortest possible string representing the number as a valid non-negative integer and then that string must be used as the new content attribute value.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
Gold foil along with silver is sometimes used on the South Asian sweets including Burfi.
[17]
Goldwasser (English: Goldwater) is a traditional herbal liqueur produced in Gdańsk, Poland, and Schwabach, Germany, and contains flakes of gold leaf. There are also some expensive (~$1000) cocktails which contain flakes of gold leaf.[18] .^ Since they are not all spaces, they are handled as per the "anything else" rules in the " in table " insertion mode, which defer to the " in body " insertion mode but with foster parenting .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ This has the effect of reopening all the formatting elements that were opened in the current body, cell, or caption (whichever is youngest) that haven't been explicitly closed.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ This can cause, amongst other strange effects, content to be appended to nodes that are no longer in the DOM. .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
[19]
Industry
.^ Melanoma that has spread down through the papillary dermis (the thin top layer of the dermis) but not into the reticular dermis (the thick bottom layer of the dermis).- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
Toi museum,
Japan.
- Gold solder is used for joining the components of gold jewelry by high-temperature hard soldering or brazing. .^ Where the output format allows it, the color of pixels in resources created by toDataURL() must match those returned by the getImageData() method.
- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ If multiple application caches match, the user agent must use the fallback of the most appropriate application cache of those that match.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ If so, then the user agent must then get the resource from the most appropriate application cache of those that match.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
.^ The other three attributes can be used to segment the gauge's range into "low", "medium", and "high" parts, and to indicate which part of the gauge is the "optimum" part.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
.
- Gold can be made into thread and used in embroidery.
- Gold is ductile and malleable, meaning it can be drawn into very thin wire and can be beaten into very thin sheets known as gold leaf.
- Gold produces a deep, intense red color when used as a coloring agent in cranberry glass.
- In photography, gold toners are used to shift the color of silver bromide black and white prints towards brown or blue tones, or to increase their stability.^ However, a PDF viewer application that launches separate from the user agent (as opposed to using the same interface) is not a plugin by this definition.
- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ When a user agent has to split a string on commas , it must use the following algorithm: .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ When the steps above require the user agent to obtain the result of collecting the first vCard subproperty named subname in subitem , the user agent must run the following steps: .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
Used on sepia-toned prints, gold toners produce red tones. .
- As gold is a good reflector of electromagnetic radiation such as infrared and visible light as well as radio waves, it is used for the protective coatings on many artificial satellites, in infrared protective faceplates in thermal protection suits and astronauts' helmets and in electronic warfare planes like the EA-6B Prowler.
- Gold is used as the reflective layer on some high-end CDs.
- Automobiles may use gold for heat dissipation.^ Some tumors have high levels of cyclooxygenase-2 and blocking its activity may reduce tumor growth.
- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ A system in which medical doctors and other healthcare professionals (such as nurses, pharmacists, and therapists) treat symptoms and diseases using drugs, radiation, or surgery.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ It is used to treat many conditions, including inflammation, allergies, and some cancers.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
McLaren uses gold foil in the engine compartment of its F1 model.[20]
- Gold can be manufactured so thin that it appears transparent. .^ A gas or a liquid is used to pass the mixture through a column, paper, or special plate that contains absorbing materials.
- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
The heat produced by the resistance of the gold is enough to deter ice from forming.[21]
Electronics
- The concentration of free electrons in gold metal is 5.90×1022 cm−3. .^ Some obsolete legacy attributes parse colors in a more complicated manner, using the rules for parsing a legacy color value , which are given in the following algorithm.
- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Here are some more examples showing the same picture used in different contexts, with different appropriate alternate texts each time.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ The microdata becomes even more useful when scripts can use it to expose information to the user, for example offering it in a form that can be used by other applications.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
.
- Though gold is attacked by free chlorine, its good conductivity and general resistance to oxidation and corrosion in other environments (including resistance to non-chlorinated acids) has led to its widespread industrial use in the electronic era as a thin layer coating electrical connectors of all kinds, thereby ensuring good connection.^ When an authoring tool is used to edit a non-conforming document, it may preserve the conformance errors in sections of the document that were not edited during the editing session (i.e.
- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Columns : If the current column col element has a span attribute, then parse its value using the rules for parsing non-negative integers .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ (For example, MathML, or SVG.) Some embedded content elements can have fallback content : content that is to be used when the external resource cannot be used (e.g.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
.^ Here are some more examples showing the same picture used in different contexts, with different appropriate alternate texts each time.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ The microdata becomes even more useful when scripts can use it to expose information to the user, for example offering it in a form that can be used by other applications.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Such information is already potentially problematic, but in practice the same information can more or less be obtained using the img element, and so it has been deemed acceptable.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
.^ Used as bulk metal and in lightweight alloys with magnesium for engines, also as a sacrificial electrode to protect other metals.- Mineral Species sorted by the element Mg Magnesium 16 January 2010 3:03 UTC webmineral.com [Source type: Reference]
^ These requirements, however, are outdated; UTF-8 is now widely used, such that supporting other encodings is no longer necessary, and use of CR, LF, and CRLF line breaks is commonly supported and indeed sometimes CRLF is not supported by text editors.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ A system in which medical doctors and other healthcare professionals (such as nurses, pharmacists, and therapists) treat symptoms and diseases using drugs, radiation, or surgery.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
Gold connectors are often criticized by audio-visual experts as unnecessary for most consumers and seen as simply a marketing ploy. .
- Besides sliding electrical contacts, gold is also used in electrical contacts because of its resistance to corrosion, electrical conductivity, ductility and lack of toxicity.^ However, a PDF viewer application that launches separate from the user agent (as opposed to using the same interface) is not a plugin by this definition.
- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Exposure to high levels of cadmium may cause certain cancers and other health problems.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ It would be inappropriate, however, for the user to use generic software not associated with that music site to search for tracks of a certain length by looking at this data.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
[22] Switch contacts are generally subjected to more intense corrosion stress than are sliding contacts.
- Fine gold wires are used to connect semiconductor devices to their packages through a process known as wire bonding.
Chemistry
.^ A procedure that uses gold salts (a salt form of the metal element gold) to treat diseases, such as rheumatoid arthritis.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
.^ Carbolic acid is used to make plastics, nylon, epoxy, medicines, and to kill germs.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ It is used by many cells in the body to make energy from fatty acids.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ A type of external radiation therapy that uses a special machine to make invisible, high-energy particles (protons or helium ions) that kill cancer cells.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
.^ Glass blowers Didymium Safety Glasses may be used to block out this emission to observe the less intense colors from other elements.- Mineral Species sorted by the element Na Sodium 6 January 2010 8:54 UTC webmineral.com [Source type: FILTERED WITH BAYES]
^ Some obsolete legacy attributes parse colors in a more complicated manner, using the rules for parsing a legacy color value , which are given in the following algorithm.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ This might in certain extreme cases mean limiting the use of flow elements to just a few elements, like div , b , i , and span and making liberal use of the style attribute.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
[23]
History
.^ The term "JavaScript" is used to refer to ECMA262, rather than the official term ECMAScript, since the term JavaScript is more widely known.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
Gold artifacts in the
Balkans appear from the 4th millennium BC, such as that found in the
Varna Necropolis. Gold artifacts such as the
golden hats and the
Nebra disk appeared in Central Europe from the 2nd millennium BC
Bronze Age.
.^ While the formats described here are intended to be subsets of the corresponding ISO8601 formats, this specification defines parsing rules in much more detail than ISO8601.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
[24] Egypt and especially
Nubia had the resources to make them major gold-producing areas for much of history. The earliest known map is known as the
Turin Papyrus Map and shows the plan of a
gold mine in Nubia together with indications of the local
geology. The primitive working methods are described by
Strabo and included
fire-setting. Large mines also were present across the
Red Sea in what is now
Saudi Arabia.
The legend of the
golden fleece may refer to the use of fleeces to trap gold dust from
placer deposits in the ancient world. Gold is mentioned frequently in the
Old Testament, starting with
Genesis 2:11 (at
Havilah) and is included with the gifts of the
magi in the first chapters of Matthew
New Testament. The
Book of Revelation 21:21 describes the city of
New Jerusalem as having streets "made of pure gold, clear as crystal". The south-east corner of the
Black Sea was famed for its gold.
.^ Local Date and Time state .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Date and Time state .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ A string is a valid date string with optional time if it is also one of the following: A valid date string .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
The
Mali Empire in Africa was famed throughout the
old world for its large amounts of gold.
Mansa Musa, ruler of the empire (1312–1337) became famous throughout the old world for his great
hajj to
Mecca in 1324. When he passed through
Cairo in July 1324, he was reportedly accompanied by a
camel train that included thousands of people and nearly a hundred camels. He gave away so much gold that it depressed the price in Egypt for over a decade.
[26] A contemporary Arab historian remarked:
| “ |
Gold was at a high price in Egypt until they came in that year. The mithqal did not go below 25 dirhams and was generally above, but from that time its value fell and it cheapened in price and has remained cheap till now. The mithqal does not exceed 22 dirhams or less. This has been the state of affairs for about twelve years until this day by reason of the large amount of gold which they brought into Egypt and spent there [...] |
” |
|
—Chihab Al-Umari[27]
|
The European exploration of the Americas was fueled in no small part by reports of the gold ornaments displayed in great profusion by
Native American peoples, especially in
Central America,
Peru,
Ecuador and
Colombia. The
Aztecs regarded gold as literally the product of the gods, calling it "god excrement" (
teocuitlatl in
Nahuatl).
[28]
.^ It is used to treat many conditions, including inflammation, allergies, and some cancers.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ Authors may use any value in the class attribute, but are encouraged to use the values that describe the nature of the content, rather than values that describe the desired presentation of the content.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Some obsolete legacy attributes parse colors in a more complicated manner, using the rules for parsing a legacy color value , which are given in the following algorithm.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
.^ When the 'font-weight' component is set to the relative values 'bolder' and 'lighter', these must be interpreted relative to the computed value of the 'font-weight' property of the corresponding canvas element at the time that the attribute is set.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ When the Window object is indexed for property retrieval using a name name , then the user agent must return the value obtained using the following steps: .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ These values are all case-sensitive — they must be used exactly as shown.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
Gold as a sign of wealth and prestige was made fun of by
Thomas More in his treatise
Utopia. On that imaginary island, gold is so abundant that it is used to make chains for slaves, tableware and lavatory-seats.
.^ This ensures that, if the script is external, any document.write() calls in the script will execute in-line, instead of blowing the document away, as would happen in most other cases.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
There is an age-old tradition of biting gold in order to test its authenticity.
.^ Although there is no formal way to indicate the language of computer code being marked up, authors who wish to mark code elements with the language used, e.g.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
The purer the gold the easier it should be to mark it. Painted lead can cheat this test because lead is softer than gold (and may invite a small risk of
lead poisoning if sufficient lead is absorbed by the biting).
.^ XBL2) to match local conventions, while the year is not marked up at all, since marking it up would not be particularly useful.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ In such cases, the XML parser must act as it would have if faced with a single string consisting of the concatenation of all those characters.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ However, the user agent would not expose those times; it would instead expose the times as 00:15..00:29 and 00:29..01:02, as a single video.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
[29]
.^ Carcinoid tumors may spread to the liver or other sites in the body, and they may secrete substances such as serotonin or prostaglandins, causing carcinoid syndrome.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ In other words, the ranges in such an object are ordered, don't overlap, aren't empty, and don't touch (adjacent ranges are folded into one bigger range).- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ For example, one group may have been exposed to a particular substance that the other was not.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
Although they never succeeded in this attempt, the alchemists promoted an interest in what can be done with substances, and this laid a foundation for today's
chemistry. Their symbol for gold was the
circle with a point at its center (☉), which was also the
astrological symbol and the ancient
Chinese character for the
Sun. For modern creation of artificial gold by
neutron capture, see
gold synthesis.
During the 19th century,
gold rushes occurred whenever large gold deposits were discovered.
.^ When this method is invoked, the user agent must remove from the session history all the entries from the first state object entry for that Document object up to the last entry that references that same Document object, if any.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ When fetching resources in response to a call to an API The active document of the browsing context of the first script .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ If the specified entry is a state object or the first entry for a Document , the user agent must activate that entry .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
[31] Further gold rushes occurred in
California,
Colorado, the
Black Hills,
Otago,
Australia,
Witwatersrand, and the
Klondike.
.^ The action of an element is the value of the element's formaction attribute, if the element is a submit button and has such an attribute, or the value of its form owner 's action attribute, if it has one, or else the empty string.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Mutating the CSSStyleDeclaration object must create a style attribute on the element (if there isn't one already) and then change its value to be a value representing the serialized form of the CSSStyleDeclaration object.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Exactly one property with the name value must be present within the item that forms the value of a label property of an item with the type vcard .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
Occurrence
This 156-ounce (4.85 kg) nugget was found by an individual prospector in the Southern California Desert using a metal detector.
.^ If the value attribute is not specified but the max attribute is specified and the result of processing the textContent of the element was one number with no associated denominator punctuation character, then that number is the actual value.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ If there is exactly one number in the contents of the element, then value is that number; otherwise, value is the value of the value attribute.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ A metallic element that occurs naturally in tiny amounts in air, water, soil, and food.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
.^ If index is less than −1 or greater than the number of elements in rows collection: The method must raise an INDEX_SIZE_ERR exception.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ If applying the rules for parsing non-negative integers to the attribute's value results in a number greater than zero, then the element's character height is that value; otherwise, it is 2.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ When the element is suffering from an overflow , if the maximum is not less than the minimum , the user agent must set the element's value to a valid floating point number that represents the maximum .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
.^ User agents should allow users to insert new paragraphs into elements that contains only content other than paragraphs.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Space characters before the root html element, and space characters at the start of the html element and before the head element, will be dropped when the document is parsed; space characters after the root html element will be parsed as if they were at the end of the body element.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ HTML, SVG, and MathML elements define which classes they are in by having an attribute with no namespace with the name class containing a space-separated list of classes to which the element belongs.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
On Earth, whenever elemental gold occurs, it appears most often as a metal
solid solution of gold with silver, i.e. a gold silver alloy. Such alloys usually have a silver content of 8–10%.
.^ Some elements, most notably area , can correspond to more than one distinct focusable area.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ If applying the rules for parsing non-negative integers to the attribute's value results in a number greater than zero, then the element's character width is that value; otherwise, it is 20.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ The following, however, is incorrect usage, as the cite element here is containing far more than the title of the work: .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
Electrum's color runs from golden silvery to silvery, dependent upon the silver content. The more silver, the lower the
specific gravity.
Relative sizes of a an 860kg rock ore, and the 30g of gold that can be extracted from it.
Toi gold mine,
Japan.
Gold left behind after
pyrite cube dissolved away.
Gold is found in
ores made up of rock with very small or microscopic particles of gold. This gold ore is often found together with
quartz or
sulfide minerals such as
Fool's Gold, which is a
pyrite.
[32] These are called "lode" deposits.
.^ A type of mole formed by groups of nevus cells found in the epidermis and dermis (the two main layers of tissue that make up the skin).- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
.^ The action of an element is the value of the element's formaction attribute, if the element is a submit button and has such an attribute, or the value of its form owner 's action attribute, if it has one, or else the empty string.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ When forms are submitted, the data in the form is converted into the form specified by the enctype , and then sent to the destination specified by the action using the given method .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ A procedure that uses gold salts (a salt form of the metal element gold) to treat diseases, such as rheumatoid arthritis.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
Recent research suggests that microbes can sometimes play an important role in forming gold deposits, transporting and precipitating gold to form grains and nuggets that collect in alluvial deposits.
[33]
Production
World gold production trend
The entrance to an underground gold mine in Victoria, Australia
Pure gold precipitate produced by the aqua regia refining process
Gold extraction is most economical in large, easily mined deposits. Ore grades as little as 0.5 g/1000 kg (0.5 parts per million, ppm) can be economical. Typical ore grades in
open-pit mines are 1–5 g/1000 kg (1–5 ppm); ore grades in underground or
hard rock mines are usually at least 3 g/1000 kg (3 ppm). Because ore grades of 30 g/1000 kg (30 ppm) are usually needed before gold is visible to the naked eye, in most gold mines the gold is invisible.
Since the 1880s, South Africa has been the source for a large proportion of the world’s gold supply, with about 50% of all gold ever produced having come from
South Africa. Production in 1970 accounted for 79% of the world supply, producing about 1,000
tonnes. However by 2007 production was just 272 tonnes. This sharp decline was due to the increasing difficulty of extraction, changing economic factors affecting the industry, and tightened safety auditing. In 2007
China (with 276 tonnes) overtook South Africa as the world's largest gold producer, the first time since 1905 that South Africa has not been the largest.
[34]
The city of
Johannesburg located in South Africa was founded as a result of the
Witwatersrand Gold Rush which resulted in the discovery of some of the largest gold deposits the world has ever seen.
.^ In the descriptions below, the source image, A , is the shape or image being rendered, and the destination image, B , is the current state of the bitmap.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
The
Second Boer War of 1899–1901 between the
British Empire and the
Afrikaner Boers was at least partly over the rights of miners and possession of the gold wealth in South Africa.
Other major producers are the United States, Australia, Russia and
Peru.
.^ If the shape attribute represents the rectangle state , and the first number in the list is numerically less than the third number in the list, then swap those two numbers around.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
In South America, the controversial project
Pascua Lama aims at exploitation of rich fields in the high mountains of
Atacama Desert, at the border between
Chile and
Argentina. Today about one-quarter of the world gold output is estimated to originate from artisanal or small scale mining.
[35]
After initial production, gold is often subsequently refined industrially by the
Wohlwill process or the
Miller process. Other methods of assaying and purifying smaller amounts of gold include parting and inquartation as well as
cuppelation, or refining methods based on the dissolution of gold in aqua regia.
The world's
oceans hold a vast amount of gold, but in very low concentrations (perhaps 1–2 parts per 10 billion, e.g. every
cubic kilometer of water could contain 10 to 20 kg of gold). But more realistic estimates put the amount of gold on average at 13 parts per trillion
[36]; concentrations of 1 ppb seem to have been identified in the discharge of rivers that run though placer deposits.
.^ They may occur in people of all ages, but are most common in the elderly.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
A so-called reverend, Prescott Jernegan ran a gold-from-seawater swindle in the
United States in the 1890s. A British fraudster ran the same scam in
England in the early 1900s.
[37] Fritz Haber (the German inventor of the
Haber process) did research on the extraction of gold from sea water in an effort to help pay
Germany's reparations following
World War I.
[38] Based on the published values of 2 to 64 ppb of gold in seawater a commercially successful extraction seemed possible. After analysis of 4000 water samples yielding an average of 0.004 ppb it became clear that the extraction would not be possible and he stopped the project.
[39] No commercially viable mechanism for performing gold extraction from sea water has yet been identified.
Gold synthesis is not economically viable and is unlikely to become so in the foreseeable future
At the end of 2006, it was estimated that all the gold ever mined totaled 158,000 tonnes
[40] and its January 2009 issue,
National Geographic magazine writes: "In all of history, only 161,000 tons of gold have been mined, barely enough to fill two Olympic-size swimming pools."
[1] This can be represented by a cube with an edge length of about 20.28 meters.
.^ These controls are all expected to be about one line high, and about as wide as necessary to show the widest possible value.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
[41]
Gold is so stable and so valuable that it is always recovered and recycled.
.^ Split fn on spaces , and let part one be the first resulting token, and part two be the second, if any, or the empty string if there is no second token.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Within each item with the type vcard , there must be no more than one label property item with a type property whose value is pref .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ If there is no selection, then, where in the description above refers to the selection, the user agent must act as if the selection was an empty range (with just one position) at the caret position.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
[42]
Consumption
India is the world’s largest consumer of gold, as Indians buy about 25% of the world’s gold,
[43] purchasing approximately 800 tonnes of gold every year. India is also the largest importer of the yellow metal; in 2008 India imported around 400 tonnes of gold.
[44]
Chemistry
.^ A procedure that uses gold salts (a salt form of the metal element gold) to treat diseases, such as rheumatoid arthritis.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
The
oxidation state of gold in its compounds ranges from −1 to +5, but Au(I) and Au(III) dominate its chemistry. Au(I), referred to as the aurous ion, is the most common oxidation state with soft
ligands such as
thioethers,
thiolates, and tertiary
phosphines. Au(I) compounds are typically linear. A good example is
Au(CN)2−, which is the soluble form of gold encountered in mining. Curiously, aurous complexes of water are rare.
.^ A procedure that uses gold salts (a salt form of the metal element gold) to treat diseases, such as rheumatoid arthritis.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
Most drugs based on gold are Au(I) derivatives.
[45]
Au(III) (auric) is a common oxidation state and is illustrated by
gold(III) chloride, AuCl
3. Au(III) complexes, like other d
8 compounds, are typically
square planar.
Aqua regia (Royal Water), a 1:3 mixture of
nitric acid and
hydrochloric acid, dissolves it.
.^ A chemical compound that binds tightly to metal ions.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
However, the ions are removed from the equilibrium by hydrochloric acid, forming AuCl
4– ions, or
chloroauric acid, thereby enabling further oxidation.
Less common oxidation states
Less common oxidation states of gold include −1, +2, and +5.
The −1 oxidation state occurs in compounds containing the Au
− anion, called aurides.
Caesium auride (CsAu), for example, crystallizes in the
caesium chloride motif.
[47] Other aurides include those of
Rb+,
K+, and tetramethylammonium (CH
3)
4N
+.
[48]
Gold(II) compounds are usually
diamagnetic with Au–Au bonds such as [Au(CH
2)
2P(C
6H
5)
2]
2Cl
2. The evaporation of a solution of
Au(OH)3 in concentrated
H2SO4 produces red crystals of gold(II) sulfate,
AuSO4. Originally thought to be a mixed-valence compound, it has been shown to contain
Au4+2 cations.
[49][50] A noteworthy, legitimate gold(II) complex is the
tetraxenonogold(II) cation, which contains
xenon as a ligand, found in [AuXe
4](Sb
2F
11)
2.
[51]
Gold pentafluoride and its derivative anion,
AuF−6, is the sole example of gold(V), the highest verified oxidation state.
[52]
Some gold compounds exhibit
aurophilic bonding, which describes the tendency of gold ions to interact at distances that are too long to be a conventional Au–Au bond but shorter that
van der Waals bonding. The interaction is estimated to be comparable in strength to that of a
hydrogen bond.
Mixed valence compounds
Well-defined cluster compounds are numerous.
[48] In such cases, gold has a fractional oxidation state. A representative example is the octahedral species {Au(
P(C6H5)3)}
62+.
Gold chalcogenides, such as gold sulfide, feature equal amounts of Au(I) and Au(III).
Toxicity
.^ The form attribute is used to explicitly associate the object element with its form owner .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Submittable elements Denotes elements that can be used for constructing the form data set when a form element is submitted .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Columns : If the current column col element has a span attribute, then parse its value using the rules for parsing non-negative integers .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
Metallic gold is also a component of the alcoholic drinks
Goldschläger,
Gold Strike, and
Goldwasser. Metallic gold is approved as a
food additive in the EU (
E175 in the
Codex Alimentarius).
.^ A chemical compound that binds tightly to metal ions.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ The gold salts stop cells from releasing chemicals that can harm tissues.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ The process by which normal cells are transformed into cancer cells.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
.^ A procedure that uses gold salts (a salt form of the metal element gold) to treat diseases, such as rheumatoid arthritis.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
.^ A procedure that uses gold salts (a salt form of the metal element gold) to treat diseases, such as rheumatoid arthritis.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
There are rare cases of lethal gold poisoning from potassium gold cyanide.
[54][55] .^ In medicine, chelating agents are used to remove toxic metals from the body.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
Gold metal was voted
Allergen of the Year in 2001 by the American Contact Dermatitis Society. Gold contact allergies affect mostly women.
[56] Despite this, gold is a relatively non-potent contact allergen, in comparison with metals like
nickel.
[57]
Price
Gold price per troy ounce in USD since 1960, in nominal US$ and inflation adjusted in 2008 US$.
Like other precious metals, gold is measured by
troy weight and by
grams.
.^ A procedure that uses gold salts (a salt form of the metal element gold) to treat diseases, such as rheumatoid arthritis.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
^ Instead, the term "expected" is used to indicate behavior that will lead to this experience.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ If the data attribute is absent but the type attribute is present, plugins aren't being sandboxed , and the user agent can find a plugin suitable according to the value of the type attribute, then that plugin should be used .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
The purity of a
gold bar or coin can also be expressed as a decimal figure ranging from 0 to 1, known as the
millesimal fineness, such as 0.995 being very pure.
The price of gold is determined through trading in the gold and
derivatives markets, but a procedure known as the
Gold Fixing in
London, originating in September 1919, provides a daily benchmark price to the industry. The afternoon fixing was introduced in 1968 to provide a price when US markets are open.
Historically gold
coinage was widely used as currency; When
paper money was introduced, it typically was a
receipt redeemable for gold coin or bullion. In an economic system known as the
gold standard, a certain
weight of gold was given the name of a unit of currency.
.^ State is newly equal to or greater than HAVE_FUTURE_DATA , paused is false, seeking is false, or the current playback position is contained in one of the ranges in buffered .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ On setting, the value attribute must set the selectedness of all the option elements in the list of options to false, and then first the option element in the list of options , in tree order , whose value is equal to the given new value, if any, must have its selectedness set to true.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Otherwise, for each entry in input list whose unit is percentage , set the corresponding value in output list to the number of the entry in input list multiplied by the input dimension and divided by 100.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
By 1961 it was becoming hard to maintain this price, and a pool of US and European banks agreed to manipulate the market to prevent further
currency devaluation against increased gold demand.
In 2005 the
World Gold Council estimated total global gold supply to be 3,859 tonnes and demand to be 3,754 tonnes, giving a surplus of 105 tonnes.
[58]
.^ The low attribute specifies the range that is considered to be the "low" part, and the high attribute specifies the range that is considered to be the "high" part.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ The other three attributes can be used to segment the gauge's range into "low", "medium", and "high" parts, and to indicate which part of the gauge is the "optimum" part.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
[59] The period from 1999 to 2001 marked the "
Brown Bottom" after a 20-year
bear market.
[60] Prices increased rapidly from 1991, but the 1980 high was not exceeded until January 3, 2008 when a new maximum of $865.35 per
troy ounce was set (a.m. London Gold Fixing).
[61] Another record price was set on March 17, 2008 at $1023.50/oz ($32,900/kg)(am. London Gold Fixing).
[61] In the fall of 2009, gold markets experience renewed momentum upwards due to increased demand and a weakening US dollar. On December 2nd 2009, Gold passed the important barrier of US$1200 per ounce to close at $1215.
[62]
.^ End [ = value ] Returns the offset to the end of the selection.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ If an element has a maximum that is less than its minimum , then so long as the element has a value , it will either be suffering from an underflow or suffering from an overflow .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
^ Within each item with the type vcard , there must be no more than one label property item with a type property whose value is pref .- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
[64]
Symbolism
Gold bars at the Emperor Casino in
Macau
Gold has been highly valued in many societies throughout the ages. In keeping with this it has often had a strongly positive symbolic meaning closely connected to the values held in the highest esteem in the society in question. Gold may symbolize power, strength, wealth, warmth, happiness, love, hope, optimism, intelligence, justice, balance, perfection, summer, harvest and the sun.
Aristotle in his
ethics used gold symbolism when referring to what is now commonly known as the "
golden mean". Similarly, gold is associated with perfect or divine principles, such as in the case of
Phi, which is sometimes called the "
golden ratio".
Gold represents great value. Respected people are treated with the most valued rule, the "
golden rule". A company may give its most valued customers "gold cards" or make them "gold members". We value moments of peace and therefore we say: "silence is golden". In Greek mythology there was the the "
golden fleece".
Gold is further associated with the wisdom of aging and fruition. The fiftieth
wedding anniversary is golden. Our precious latter years are sometimes considered "golden years". The height of a civilization is referred to as a "
golden age".
Medieval kings were inaugurated under the signs of
sacred oil and a golden crown, the latter symbolizing the eternal shining light of heaven and thus a Christian king's divinely inspired authority.
Wedding rings have long been made of gold.
.^ A condition lasting for more than 6 months in which a person feels tired most of the time and may have trouble concentrating and carrying out daily activities.- Dictionary of Cancer Terms - National Cancer Institute 10 February 2010 12:52 UTC www.cancer.gov [Source type: Academic]
In
Orthodox Christianity, the wedded couple is adorned with a golden crown during the ceremony, an amalgamation of symbolic rites.
.^ In general, user agents are expected to support CSS, and many of the suggestions in this section are expressed in CSS terms.- HTML5 25 September 2009 2:33 UTC dev.w3.org [Source type: Reference]
and "golden boy". Gold also still holds its place as a symbol of wealth and through that, in many societies, success.
State emblem
In 1965 the
California Legislature designated gold “the State Mineral and mineralogical emblem.”
[65]
In 1968 the
Alaska Legislature named gold “the official state mineral.”
[66]
See also
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- ^ "Relativity in Chemistry". Math.ucr.edu. http://math.ucr.edu/home/baez/physics/Relativity/SR/gold_color.html. Retrieved 2009-04-05.
- ^ Schmidbaur, Hubert; Cronje, Stephanie; Djordjevic, Bratislav; Schuster, Oliver (2005). "Understanding gold chemistry through relativity". Chemical Physics 311: 151–161. doi:10.1016/j.chemphys.2004.09.023.
- ^ "Gold Jewellery Alloys > Utilise Gold. Scientific, industrial and medical applications, products ,suppliers from the World Gold Council". Utilisegold.com. 2000-01-20. http://www.utilisegold.com/jewellery_technology/colours/colour_alloys/. Retrieved 2009-04-05.
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- ^ Beinhoff, Christian. Removal of Barriers to the Abatement of Global Mercury Pollution from Artisanal Gold Mining. http://www.unido.org/fileadmin/import/10644_CHRISTIANtext.3.pdf.
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- World Gold Council, Jewellery Technology, Jewellery Alloys
External links