Rhodium-91
Properties and data of the isotope 91Rh.
See also: List of individual Rhodium isotopes (and general data sources).
General data
Name of the isotope:Rhodium-91; Rh-91Symbol:91Rh or 9145RhMass number A:91 (= number of nucleons)Atomic number Z:45 (= number of protons)Neutrons N:46Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.0222222222222 (= neutron-proton ratio)Neutron excess (N-Z):1Isotopic mass:90.93712(32) u (atomic weight of Rhodium-91)Nuclide mass:90.9124352 u (calculated nuclear mass without electrons)Mass excess:-58.57234 MeVMass defect:0.81359257600002 u (per nucleus)Nuclear binding energy:757.85660299 MeV (per nucleus)
8.32809454 MeV (average binding energy per nucleon)Separation energy:SN = 14.94(42) MeV (first neutron)
SP = 0.97(30) MeV (first proton)Half-life:1.47(22) sDecay constant λ:0.47152869425847 s-1Specific activity α:3.155124684807 × 10+21 Bq g-1
85273640129.927 Ci g-1Spin and parity:
(nuclear angular momentum)(9/2+)Mirror nucleus:Palladium-91Year of discovery:1994
Radioactive Decay
Half-life T½ = 1.47(22) s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 91Ru | 98.7 % | 9.67(30) MeV | |
| β+, p | 90Tc | 1.3(5) % | | |
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 |
|---|
| 91mRh | 172.9(4) keV | 1.46(11) s | (1/2-) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 46) and isobaric (same nucleon number A = 91) with Rhodium-91. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 46 | Isobar A = 91 |
|---|
| 25 | 71Mn | |
| 26 | 72Fe | |
| 27 | 73Co | |
| 28 | 74Ni | |
| 29 | 75Cu | |
| 30 | 76Zn | |
| 31 | 77Ga | |
| 32 | 78Ge | |
| 33 | 79As | 91As |
| 34 | 80Se | 91Se |
| 35 | 81Br | 91Br |
| 36 | 82Kr | 91Kr |
| 37 | 83Rb | 91Rb |
| 38 | 84Sr | 91Sr |
| 39 | 85Y | 91Y |
| 40 | 86Zr | 91Zr |
| 41 | 87Nb | 91Nb |
| 42 | 88Mo | 91Mo |
| 43 | 89Tc | 91Tc |
| 44 | 90Ru | 91Ru |
| 45 | 91Rh | 91Rh |
| 46 | 92Pd | 91Pd |
| 47 | 93Ag | |
| 48 | 94Cd | |
External data and identifiers
Last update: 2023-10-04
Perma link: https://www.chemlin.org/isotope/rhodium-91
© 1996 - 2026 ChemLin
