Naturally occurring rhodium (Rh) is composed of only one 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. See isotopes of rhodium.
Additional recommended knowledge
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]
|
|
|
|
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
- Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
- Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005).
- Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
- Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
- David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.
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