Rubidium-85m
Properties and data of the isotope 85mRb.
See also: list of Rubidium isotopes.
General data
Name of the isotope:Rubidium-85m; Rb-85mSymbol:85mRb or 85m37RbMass number A:85 (= number of nucleons)Atomic number Z:37 (= number of protons)Neutrons N:48Isotopic mass:84.91178974(3) u (atomic weight of Rubidium-85m)
Excitation energy: 514.0065(22) keVNuclide mass:84.8914931 u (calculated nuclear mass without electrons)Mass excess:-82.16733 MeVMass defect:0.793652412 u (per nucleus)Nuclear binding energy:739.28245986 MeV (per nucleus)
8.6974407 MeV (average binding energy per nucleon)Half-life:1.015 μsDecay constant λ:682903.62616743 s-1Specific activity α:4.895883131597 × 10+27 Bq g-1
1.323211657188 × 10+17 Ci g-1Spin and parity:
(nuclear angular momentum)9/2+Magnetic dipole moment:μ(μN) = +6.043(5)Quadrupole moment Q:-0.70(2) barn (100 fm2)Nuclear g-factor:gl = 1.3428888888889
Radioactive Decay
Half-life T½ = 1.015 μs respectively 1.015 × 10-6 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
Iso | 85Rb | 100 % | | |
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
Nuclear Isomer | Excitation Energy | Half-life | Spin |
---|
85Rb | | stable | 5/2- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 48) and isobaric (same nucleon number A = 85) with Rubidium-85m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 48 | Isobar A = 85 |
26 | 74Fe | |
27 | 75Co | |
28 | 76Ni | |
29 | 77Cu | |
30 | 78Zn | 85Zn |
31 | 79Ga | 85Ga |
32 | 80Ge | 85Ge |
33 | 81As | 85As |
34 | 82Se | 85Se |
35 | 83Br | 85Br |
36 | 84Kr | 85Kr |
37 | 85Rb | 85Rb |
38 | 86Sr | 85Sr |
39 | 87Y | 85Y |
40 | 88Zr | 85Zr |
41 | 89Nb | 85Nb |
42 | 90Mo | 85Mo |
43 | 91Tc | 85Tc |
44 | 92Ru | 85Ru |
45 | 93Rh | |
46 | 94Pd | |
47 | 95Ag | |
48 | 96Cd | |
49 | 97In | |
Last update: 2020-10-14
Perma link: https://www.chemlin.org/isotope/rubidium-85m
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