Isotopes of the Element Rubidium
[Click for Main Data]

Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.

Isotopes of the Element Rubidium with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

85	72.17%	Stable

87	27.83%	4.81×10⁺¹⁰ years

All Known Isotopes of the Element Rubidium

Mass Number	Half-life	Decay Mode	Branching Percentage

71	No Data Available	Proton Emission	No Data Available

72	< 1.2 microseconds	Proton Emission	No Data Available

73	< 30 nanoseconds	Electron Capture	No Data Available

		Proton Emission	> 0.00

74	64.9 milliseconds	Electron Capture	100.00

75	19.0 seconds	Electron Capture	100.00

76	36.5 seconds	Electron Capture	100.00

		Electron Capture with delayed Alpha Decay	3.8E-7

77	3.77 minutes	Electron Capture	100.00

78	17.66 minutes	Electron Capture	100.00

78_m	5.74 minutes	Electron Capture	90.00

		Isomeric Transition	10.00

79	22.9 minutes	Electron Capture	100.00

80	33.4 seconds	Electron Capture	100.00

81	4.576 hours	Electron Capture	100.00

81_m	30.5 minutes	Isomeric Transition	97.60

		Electron Capture	2.40

82	1.273 minutes	Electron Capture	100.00

82_m	6.472 hours	Electron Capture	100.00

		Isomeric Transition	< 0.33

83	86.2 days	Electron Capture	100.00

84	32.77 days	Electron Capture	96.20

		Beta-minus Decay	3.80

84_m	20.26 minutes	Isomeric Transition	100.00

85	Stable	-	-

86	18.642 days	Beta-minus Decay	99.99

		Electron Capture	5.2E-3

86_m	1.017 minutes	Isomeric Transition	100.00

		Beta-minus Decay	< 0.30

87	4.81×10⁺¹⁰ years	Beta-minus Decay	100.00

88	17.78 minutes	Beta-minus Decay	100.00

89	15.15 minutes	Beta-minus Decay	100.00

90	158 seconds	Beta-minus Decay	100.00

90_m	258 seconds	Beta-minus Decay	97.40

		Isomeric Transition	2.60

91	58.4 seconds	Beta-minus Decay	100.00

92	4.492 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	0.01

93	5.84 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	1.39

94	2.702 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	10.01

95	377.5 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	8.73

96	202.8 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	14.00

97	169.9 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	25.10

98	114 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	13.80

		Beta-minus Decay	0.05

98_m	96 milliseconds	Beta-minus Decay	100.00

99	50.3 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	15.90

100	51 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	6.00

		Beta-minus Decay with delayed Double Neutron Emission	0.16

101	32 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	28.00

This page is maintained by Steve Gagnon.

Citation and linking information

Isotopes of the Element Rubidium[Click for Main Data]

Isotopes of the Element Rubidium
[Click for Main Data]