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Isotopes of rhodium: Wikis

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Naturally occurring rhodium (Rh) is composed of only one stable isotope, 103Rh. The most stable radioisotopes are 101Rh with a half-life of 3.3 years, 102Rh with a half-life of 207 days, 102mRh with a half-life of 2.9 years, and 99Rh with a half-life of 16.1 days. Twenty other radioisotopes have been characterized with atomic weights ranging from 92.926 u (93Rh) to 116.925 u (117Rh). Most of these have half-lifes that are less than an hour except 100Rh (half-life: 20.8 hours) and 105Rh (half-life: 35.36 hours). There are also numerous meta states with the most stable being 102mRh (0.141 MeV) with a half-life of about 207 days and 101mRh (0.157 MeV) with a half-life of 4.34 days.

The primary decay mode before the only stable isotope, 103Rh, is electron capture and the primary mode after is beta emission. The primary decay product before 103Rh is ruthenium and the primary product after is palladium.
Standard atomic mass: 102.90550(2) u

Table

nuclide
symbol
Z(p) N(n)  
isotopic mass (u)
 
half-life nuclear
spin
representative
isotopic
composition
(mole fraction)
range of natural
variation
(mole fraction)
excitation energy
89Rh 45 44 88.94884(48)# 10# ms [>1.5 µs] 7/2+#
90Rh 45 45 89.94287(54)# 15(7) ms [12(+9-4) ms] 0+#
90mRh 0(500)# keV 1.1(3) s [1.0(+3-2) s 9+#
91Rh 45 46 90.93655(43)# 1.74(14) s 7/2+#
91mRh 1.46(11) s (1/2-)
92Rh 45 47 91.93198(43)# 4.3(13) s (6+)
92mRh 4.66(25) s [2.9(+15-8) s] (>=6+)
93Rh 45 48 92.92574(43)# 11.9(7) s 9/2+#
94Rh 45 49 93.92170(48)# 70.6(6) s (2+,4+)
94mRh 300(200)# keV 25.8(2) s (8+)
95Rh 45 50 94.91590(16) 5.02(10) min (9/2)+
95mRh 543.3(3) keV 1.96(4) min (1/2)-
96Rh 45 51 95.914461(14) 9.90(10) min (6+)
96mRh 52.0(1) keV 1.51(2) min (3+)
97Rh 45 52 96.91134(4) 30.7(6) min 9/2+
97mRh 258.85(17) keV 46.2(16) min 1/2-
98Rh 45 53 97.910708(13) 8.72(12) min (2)+
98mRh 60(50)# keV 3.6(2) min (5+)
99Rh 45 54 98.908132(8) 16.1(2) d 1/2-
99mRh 64.3(4) keV 4.7(1) h 9/2+
100Rh 45 55 99.908122(20) 20.8(1) h 1-
100m1Rh 107.6(2) keV 4.6(2) min (5+)
100m2Rh 74.78(2) keV 214.0(20) ns (2)+
100m3Rh 112.0+X keV 130(10) ns (7+)
101Rh 45 56 100.906164(18) 3.3(3) a 1/2-
101mRh 157.32(4) keV 4.34(1) d 9/2+
102Rh 45 57 101.906843(5) 207.0(15) d (1-,2-)
102mRh 140.75(8) keV 3.742(10) a 6+
103Rh 45 58 102.905504(3) STABLE 1/2- 1.0000
103mRh 39.756(6) keV 56.114(9) min 7/2+
104Rh 45 59 103.906656(3) 42.3(4) s 1+
104mRh 128.967(4) keV 4.34(3) min 5+
105Rh 45 60 104.905694(4) 35.36(6) h 7/2+
105mRh 129.781(4) keV 42.9(3) s 1/2-
106Rh 45 61 105.907287(8) 29.80(8) s 1+
106mRh 136(12) keV 131(2) min (6)+
107Rh 45 62 106.906748(13) 21.7(4) min 7/2+
107mRh 268.36(4) keV >10 µs 1/2-
108Rh 45 63 107.90873(11) 16.8(5) s 1+
108mRh -60(110) keV 6.0(3) min (5)(+#)
109Rh 45 64 108.908737(13) 80(2) s 7/2+
110Rh 45 65 109.91114(5) 28.5(15) s (>3)(+#)
110mRh -60(50) keV 3.2(2) s 1+
111Rh 45 66 110.91159(3) 11(1) s (7/2+)
112Rh 45 67 111.91439(6) 3.45(37) s 1+
112mRh 330(70) keV 6.73(15) s (4,5,6)
113Rh 45 68 112.91553(5) 2.80(12) s (7/2+)
114Rh 45 69 113.91881(12) 1.85(5) s 1+
114mRh 200(150)# keV 1.85(5) s (4,5)
115Rh 45 70 114.92033(9) 0.99(5) s (7/2+)#
116Rh 45 71 115.92406(15) 0.68(6) s 1+
116mRh 200(150)# keV 570(50) ms (6-)
117Rh 45 72 116.92598(54)# 0.44(4) s (7/2+)#
118Rh 45 73 117.93007(54)# 310(30) ms (4-10)(+#)
119Rh 45 74 118.93211(64)# 300# ms [>300 ns] 7/2+#
120Rh 45 75 119.93641(64)# 200# ms [>300 ns]
121Rh 45 76 120.93872(97)# 100# ms [>300 ns] 7/2+#
122Rh 45 77 121.94321(75)# 50# ms [>300 ns]
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Notes

  • Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
  • Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

References

Isotopes of ruthenium Isotopes of rhodium Isotopes of palladium
Index to isotope pages · Table of nuclides

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