Rhodium-109
Properties and data of the isotope 109Rh.
See also: List of individual Rhodium isotopes (and general data sources).
General data
Name of the isotope:Rhodium-109; Rh-109Symbol:109Rh or 10945RhMass number A:109 (= number of nucleons)Atomic number Z:45 (= number of protons)Neutrons N:64Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.4222222222222 (= neutron-proton ratio)Neutron excess (N-Z):19Isotopic mass:108.908749(4) u (atomic weight of Rhodium-109)Nuclide mass:108.8840642 u (calculated nuclear mass without electrons)Mass excess:-84.99976 MeVMass defect:0.997932064 u (per nucleus)Nuclear binding energy:929.56773002 MeV (per nucleus)
8.52814431 MeV (average binding energy per nucleon)Separation energy:SN = 8.039(15) MeV (first neutron)
SP = 8.627(10) MeV (first proton)Half-life:80.8(7) sDecay constant λ:0.0085785542148508 s-1Specific activity α:4.783450171892 × 10+19 Bq g-1
1292824370.7817 Ci g-1Spin and parity:
(nuclear angular momentum)7/2+Year of discovery:1972
Radioactive Decay
Half-life T½ = 80.8(7) s respectively 8.08 × 101 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 109Pd | 100 % | 2.607(4) MeV | |
Parent Nuclides
Direct parent isotope is: 109Ru.
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 |
|---|
| 109mRh | 225.873(19) keV | 1.66(4) μs | 3/2+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 64) and isobaric (same nucleon number A = 109) with Rhodium-109. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 64 | Isobar A = 109 |
|---|
| 36 | 100Kr | |
| 37 | 101Rb | |
| 38 | 102Sr | |
| 39 | 103Y | 109Y |
| 40 | 104Zr | 109Zr |
| 41 | 105Nb | 109Nb |
| 42 | 106Mo | 109Mo |
| 43 | 107Tc | 109Tc |
| 44 | 108Ru | 109Ru |
| 45 | 109Rh | 109Rh |
| 46 | 110Pd | 109Pd |
| 47 | 111Ag | 109Ag |
| 48 | 112Cd | 109Cd |
| 49 | 113In | 109In |
| 50 | 114Sn | 109Sn |
| 51 | 115Sb | 109Sb |
| 52 | 116Te | 109Te |
| 53 | 117I | 109I |
| 54 | 118Xe | 109Xe |
| 55 | 119Cs | |
| 56 | 120Ba | |
| 57 | 121La | |
| 58 | 122Ce | |
| 59 | 123Pr | |
| 60 | 124Nd | |
External data and identifiers
Last update: 2020-10-15
Perma link: https://www.chemlin.org/isotope/rhodium-109
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