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This text-only table is a version of the large table designed for printing atomic mass data. Colors representing chemical series have been removed, and all links have been removed. The least significant digit has been dropped if its uncertainty is greater than 1. Rounding was performed in these cases.

Group 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
  I II   III IV V VI VII VIII
Period  
1 hydrogen
1
H
1.0079
  helium
2
He
4.00260
2 lithium
3
Li
6.94
beryllium
4
Be
9.01218
  boron
5
B
10.81
carbon
6
C
12.011
nitrogen
7
N
14.007
oxygen
8
O
15.999
fluorine
9
F
18.998403
neon
10
Ne
20.180
3 sodium
11
Na
22.9897693
magnesium
12
Mg
24.305
  aluminium
13
Al
26.981539
silicon
14
Si
28.086
phosphorus
15
P
30.97376
sulfur
16
S
32.06
chlorine
17
Cl
35.45
argon
18
Ar
39.948
4 potassium
19
K
39.0983
calcium
20
Ca
40.08
scandium
21
Sc
44.95591
titanium
22
Ti
47.867
vanadium
23
V
50.9415
chromium
24
Cr
51.996
manganese
25
Mn
54.93804
iron
26
Fe
55.84
cobalt
27
Co
58.93320
nickel
28
Ni
58.693
copper
29
Cu
63.55
zinc
30
Zn
65.41
gallium
31
Ga
69.723
germanium
32
Ge
72.64
arsenic
33
As
74.9216
selenium
34
Se
79.0
bromine
35
Br
79.904
krypton
36
Kr
83.80
5 rubidium
37
Rb
85.468
strontium
38
Sr
87.62
yttrium
39
Y
88.9058
zirconium
40
Zr
91.22
niobium
41
Nb
92.9064
molybdenum
42
Mo
95.9
technetium
43
Tc
[97.9072]
ruthenium
44
Ru
101.1
rhodium
45
Rh
102.9055
palladium
46
Pd
106.42
silver
47
Ag
107.868
cadmium
48
Cd
112.41
indium
49
In
114.82
tin
50
Sn
118.71
antimony
51
Sb
121.760
tellurium
52
Te
127.6
iodine
53
I
126.9045
xenon
54
Xe
131.29
6 caesium
55
Cs
132.905452
barium
56
Ba
137.33
57–71
*
hafnium
72
Hf
178.5
tantalum
73
Ta
180.9479
tungsten
74
W
183.84
rhenium
75
Re
186.207
osmium
76
Os
190.2
iridium
77
Ir
192.22
platinum
78
Pt
195.08
gold
79
Au
196.96657
mercury
80
Hg
200.6
thallium
81
Tl
204.383
lead
82
Pb
207.2
bismuth
83
Bi
208.98040
polonium
84
Po
[208.9824]
astatine
85
At
[209.9871]
radon
86
Rn
[222.0176]
7 francium
87
Fr
[223]
radium
88
Ra
[226]
89–103
**
rutherfordium
104
Rf
[261]
dubnium
105
Db
[262]
seaborgium
106
Sg
[266]
bohrium
107
Bh
[264]
hassium
108
Hs
[277]
meitnerium
109
Mt
[268]
darmstadtium
110
Ds
[271]
roentgenium
111
Rg
[272]
ununbium
112
Uub
[277]
ununtrium
113
Uut
[284]
ununquadium
114
Uuq
[289]
ununpentium
115
Uup
[288]
ununhexium
116
Uuh
[292]
ununseptium
117
Uus
[291]***
ununoctium
118
Uuo
[294]***
* Lanthanoids lanthanum
57
La
138.9055
cerium
58
Ce
140.116
praseodymium
59
Pr
140.9076
neodymium
60
Nd
144.24
promethium
61
Pm
[145]
samarium
62
Sm
150.4
europium
63
Eu
151.964
gadolinium
64
Gd
157.2
terbium
65
Tb
158.9254
dysprosium
66
Dy
162.500
holmium
67
Ho
164.9303
erbium
68
Er
167.26
thulium
69
Tm
168.9342
ytterbium
70
Yb
173.0
lutetium
71
Lu
174.967
** Actinoids actinium
89
Ac
[227]
thorium
90
Th
232.0381
protactinium
91
Pa
231.0359
uranium
92
U
238.0289
neptunium
93
Np
[237]
plutonium
94
Pu
[244]
americium
95
Am
[243]
curium
96
Cm
[247]
berkelium
97
Bk
[247]
californium
98
Cf
[251]
einsteinium
99
Es
[252]
fermium
100
Fm
[257]
mendelevium
101
Md
[258]
nobelium
102
No
[259]
lawrencium
103
Lr
[262]

*** These atomic masses are only estimates

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