Rhodium-120
Properties and data of the isotope 120Rh.
See also: List of individual Rhodium isotopes (and general data sources).
General data
Name of the isotope:Rhodium-120; Rh-120Symbol:120Rh or 12045RhMass number A:120 (= number of nucleons)Atomic number Z:45 (= number of protons)Neutrons N:75Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.6666666666667 (= neutron-proton ratio)Neutron excess (N-Z):30Isotopic mass:119.93686(21) u (atomic weight of Rhodium-120)Nuclide mass:119.9121752 u (calculated nuclear mass without electrons)Mass excess:-58.81453 MeVMass defect:1.06513514 u (per nucleus)Nuclear binding energy:992.1669921 MeV (per nucleus)
8.26805827 MeV (average binding energy per nucleon)Separation energy:SN = 4.06(20) MeV (first neutron)
SP = 13.54(36) MeV (first proton)Half-life:132 msDecay constant λ:5.251115004242 s-1Specific activity α:2.657391111535 × 10+22 Bq g-1
718213813928.51 Ci g-1Spin and parity:
(nuclear angular momentum)Year of discovery:1994
Radioactive Decay
Half-life T½ = 132 ms respectively 1.32 × 10-1 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 120Pd | > 94.6 % | 11.47(20) MeV | |
| β-, n | 119Pd | < 5.4 % | 4.52(20) MeV | |
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 |
|---|
| 120mRh | 157.2(7) keV | 0.294 μs | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 75) and isobaric (same nucleon number A = 120) with Rhodium-120. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 75 | Isobar A = 120 |
|---|
| 42 | 117Mo | |
| 43 | 118Tc | 120Tc |
| 44 | 119Ru | 120Ru |
| 45 | 120Rh | 120Rh |
| 46 | 121Pd | 120Pd |
| 47 | 122Ag | 120Ag |
| 48 | 123Cd | 120Cd |
| 49 | 124In | 120In |
| 50 | 125Sn | 120Sn |
| 51 | 126Sb | 120Sb |
| 52 | 127Te | 120Te |
| 53 | 128I | 120I |
| 54 | 129Xe | 120Xe |
| 55 | 130Cs | 120Cs |
| 56 | 131Ba | 120Ba |
| 57 | 132La | 120La |
| 58 | 133Ce | 120Ce |
| 59 | 134Pr | |
| 60 | 135Nd | |
| 61 | 136Pm | |
| 62 | 137Sm | |
| 63 | 138Eu | |
| 64 | 139Gd | |
| 65 | 140Tb | |
| 66 | 141Dy | |
| 67 | 142Ho | |
| 68 | 143Er | |
| 69 | 144Tm | |
External data and identifiers
Last update: 2020-10-15
Perma link: https://www.chemlin.org/isotope/rhodium-120
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