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Isotopes with half life more than 3 minutes are listed Fr, more than 10 minutes for all other cases.

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N.J. Stone, Table of recommended nuclear magnetic dipole moments: Part I, long-lived states, INDC(NDS)-079 Available online

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Juris Meija et al., Isotopic compositions of the elements 2013 (IUPAC Technical Report), Pure Appl. Chem. 88, 293 (2016), DOI

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I. Angeli, K.P. Marinova,Table of experimental nuclear ground state charge radii: An update, Atomic Data and Nuclear Data Tables 99, 69 (2013), DOI, Weblink

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N.J. Stone, Table of nuclear electric quadrupole moments, At. Data Nucl. Data Tables 111-112, 1 (2016), DOI

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Isotope info

Half-life info

Natural abundance (%) info
Nuclear spin

Rms radii (fm) info

Magnetic moment (μN) info Quadrupole moment (b) info
79Rb 79 Rb 23 minutes 5/2 4.2284(65) 4.2284 0.0065 3.3573(12) 3.3573 0.0012 -0.12(4) -0.12 0.04
81Rb 81 Rb 4.57 hours 3/2 4.2213(51) 4.2213 0.0051 2.0591(14) 2.0591 0.0014 0.48(10) 0.48 0.1
83Rb 83 Rb 86.2 days 5/2 4.2058(28) 4.2058 0.0028 1.4246(8) 1.4246 0.0008 0.24(5) 0.24 0.05
84Rb 84 Rb 32.8 days 2 4.1999(23) 4.1999 0.0023 -1.325(2) -1.325 0.002 -0.02(4) -0.02 0.04
85Rb 85 Rb Stable 72.17 5/2 4.2036(24) 4.2036 0.0024 1.35306(4) 1.35306 4e-05 0.276(1) 0.276 0.001
86Rb 86 Rb 18.64 days 2 4.2025(23) 4.2025 0.0023 -1.6974(16) -1.6974 0.0016 0.23(6) 0.23 0.06
87Rb 87 Rb 5x1010 years 27.83 3/2 4.1989(21) 4.1989 0.0021 2.75129(8) 2.75129 8e-05 0.1335(5) 0.1335 0.0005
88Rb 88 Rb 17.8 minutes 2 4.2170(38) 4.217 0.0038 0.50751(2) 0.50751 2e-05 -0.01(11) -0.01 0.11
89Rb 89 Rb 15.3 minutes 3/2 4.2391(74) 4.2391 0.0074 2.3831(7) 2.3831 0.0007 0.17(3) 0.17 0.03
Isotope State    Theory    Experiment
85Rb 5s1/2 1011.910813(2) E18
6s1/2 239.18(4) E19
7s1/2 94.658(19) E20
8s1/2 46.9 E1 45.5(2.0) E4
5p1/2 120.645(5) E100
6p1/2 39.02 E1 39.11(3) E22
7p1/2 17.61 E1 17.65(2) E5
8p1/2 9.45 E1
5p3/2 25.0403(11) E100
6p3/2 8.179(12) E3
7p3/2 3.61 E1 3.71(1)
8p3/2 1.94 E1 1.99(2) E25
4d3/2 7.329(35) E103
4d5/2 -4.978(4) E102
5d3/2 4.18(20) E13
5d5/2 -2.12(20) E13
87Rb 5s1/2 3417.3413070(15) E18
6s1/2 807.66(8) E19
7s1/2 319.759(28) E20
8s1/2 158.66 E39 159.2(15) E17
9s1/2 90.23 E39 90.9(8) E17
10s1/2 56.3(2) E6
11s1/2 37.4(3) E6
5p1/2 406.119(7) E100
6p1/2 132.34 E39 132.56(3) E22
7p1/2 59.78 E39 59.92(9) E22
8p1/2 32.05 E39 32.12(11) E17
9p1/2 19.59 E39
5p3/2 84.7200(16) E100
6p3/2 27.03 E39 27.700(17) E3
7p3/2 12.23 E39 12.57(1) E3
8p3/2 6.57 E39 6.739(15) E3
9p3/2 4.02 E39 4.05(3) E14
4d3/2 24.75(12) E103
4d5/2 -16.801(5) E102
5d3/2 14.43(23) E13
5d5/2 -7.44(10) E13
6d3/2 7.84(5) E15
6d5/2 -3.4(5) E28
7d3/2 4.53(3) E15
7d5/2 -2.0(3) E28
8d3/2 2.840(15) E14
8d5/2 -1.20(15) E28
9d3/2 1.90(1) E14
9d5/2 -0.80(15) E14