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Isotopes of Rubidium (Z=37)
Isotope	Half-life	Spin Parity	Decay Mode(s) or Abundance
⁷¹Rb
⁷²Rb
⁷³Rb
⁷⁴Rb	64.9 ms	(0+)	%EC+%B+=100
⁷⁵Rb	19.0 s	(3/2-,5/2-)	%EC+%B+=100
⁷⁶Rb	36.5 s	1(-)	%EC+%B+=100
⁷⁷Rb	3.77 m	3/2-	%EC+%B+=100
⁷⁸Rb	17.66 m	0(+)	%EC+%B+=100
^78m1Rb	5.74 m	4(-)	%EC+%B+=90 2, %IT=10 2
⁷⁹Rb	22.9 m	5/2+	%EC+%B+=100
⁸⁰Rb	34 s	1+	%EC+%B+=100
⁸¹Rb	4.576 h	3/2-	%EC+%B+=100
^81m1Rb	30.5 m	9/2+	%IT=97.6 6, %EC+%B+ =2.4 6
⁸²Rb	1.273 m	1+	%EC+%B+=100
^82m1Rb	6.472 h	5-	%EC+%B+=100, %IT<0.33
⁸³Rb	86.2 d	5/2-	%EC=100
^83m1Rb	7.8 ms	9/2+	%IT=?, %EC+%B+=?
⁸⁴Rb	32.77 d	2-	%B-=3.8 5, %EC+%B+=96.2 5
^84m1Rb	20.26 m	6-	%IT=100
⁸⁵Rb	stable	5/2-	%Abundance=72.165 20
⁸⁶Rb	18.631 d	2-	%B-=99.9948 5, %EC=0.0052 5
^86m1Rb	1.017 m	6-	%IT=100
⁸⁷Rb	4.75e10 y	3/2-	%Abundance=27.835 20, %B-=100
⁸⁸Rb	17.78 m	2-	%B-=100
⁸⁹Rb	15.15 m	3/2-	%B-=100
⁹⁰Rb	158 s	0-	%B-=100
^90m1Rb	258 s	3-	%B-=97.4 4, %IT=2.6 4
⁹¹Rb	58.4 s	3/2(-)	%B-=100
⁹²Rb	4.492 s	0-	%B-=100, %B-N=0.0107 5
⁹³Rb	5.84 s	5/2-	%B-=100, %B-N=1.39 7
⁹⁴Rb	2.702 s	3(-)	%B-=100, %B-N=10.4 4
⁹⁵Rb	377.5 ms	5/2-	%B-=100, %B-N=8.73 20
⁹⁶Rb	0.199 s	2+	%B-=100, %B-N=13.8 9
⁹⁷Rb	169.9 ms	3/2(+)	%B-=100, %B-N=25.1 8
⁹⁸Rb	114 ms	(1,0)	%B-=100, %B-N=13.6 5 , %B-2N=0.051 7
^98m1Rb	96 ms	(4,5)	%B-=100
⁹⁹Rb	50.3 ms	(5/2+)	%B-=100, %B-N=20.7 23
¹⁰⁰Rb	51 ms		%B-=100, %B-N=6 3 , %B-2N=0.16 8
¹⁰¹Rb	32 ms	(3/2+)	%B-=100, %B-N=28 4
¹⁰²Rb	37 ms		%B-=100 , %B-N=18 8

Isotopes of Rubidium (Z=37)