Rhodium-125
Properties and data of the isotope 125Rh.
See also: List of individual Rhodium isotopes (and general data sources).
General data
Name of the isotope:Rhodium-125; Rh-125Symbol:125Rh or 12545RhMass number A:125 (= number of nucleons)Atomic number Z:45 (= number of protons)Neutrons N:80Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.7777777777778 (= neutron-proton ratio)Neutron excess (N-Z):35Isotopic mass:124.95491(54) u (atomic weight of Rhodium-125)Nuclide mass:124.9302252 u (calculated nuclear mass without electrons)Mass excess:-42.00106 MeVMass defect:1.09040972 u (per nucleus)Nuclear binding energy:1015.71011172 MeV (per nucleus)
8.12568089 MeV (average binding energy per nucleon)Separation energy:SN = 5.18(64) MeV (first neutron)
SP = 15.33(78) MeV (first proton)Half-life:26.5(20) msDecay constant λ:26.156497379621 s-1Specific activity α:1.270307351795 × 10+23 Bq g-1
3433263112960.8 Ci g-1Spin and parity:
(nuclear angular momentum)Year of discovery:2010
Radioactive Decay
Half-life T½ = 26.5(20) ms respectively 2.65 × 10-2 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 125Pd | 100 % | 12.12(64) MeV | |
| β-, n | 124Pd | ? | 8.32(58) MeV | |
| β-, 2n | 123Pd | ? | | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 80) and isobaric (same nucleon number A = 125) with Rhodium-125. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 80 | Isobar A = 125 |
|---|
| 44 | 124Ru | |
| 45 | 125Rh | 125Rh |
| 46 | 126Pd | 125Pd |
| 47 | 127Ag | 125Ag |
| 48 | 128Cd | 125Cd |
| 49 | 129In | 125In |
| 50 | 130Sn | 125Sn |
| 51 | 131Sb | 125Sb |
| 52 | 132Te | 125Te |
| 53 | 133I | 125I |
| 54 | 134Xe | 125Xe |
| 55 | 135Cs | 125Cs |
| 56 | 136Ba | 125Ba |
| 57 | 137La | 125La |
| 58 | 138Ce | 125Ce |
| 59 | 139Pr | 125Pr |
| 60 | 140Nd | 125Nd |
| 61 | 141Pm | |
| 62 | 142Sm | |
| 63 | 143Eu | |
| 64 | 144Gd | |
| 65 | 145Tb | |
| 66 | 146Dy | |
| 67 | 147Ho | |
| 68 | 148Er | |
| 69 | 149Tm | |
| 70 | 150Yb | |
| 71 | 151Lu | |
External data and identifiers
Last update: 2020-10-15
Perma link: https://www.chemlin.org/isotope/rhodium-125
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