Isotopes of rhodium

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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.

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

[edit] 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)
nuclide symbol	excitation energy			half-life	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
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]

[edit] 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.

[edit] 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.