Ruthenium-123
Properties and data of the isotope 123Ru.
See also: list of Ruthenium isotopes.
General data
Name of the isotope:Ruthenium-123; Ru-123Symbol:123Ru or 12344RuMass number A:123 (= number of nucleons)Atomic number Z:44 (= number of protons)Neutrons N:79Isotopic mass:122.96019(54) u (atomic weight of Ruthenium-123)Nuclide mass:122.9360537 u (calculated nuclear mass without electrons)Mass excess:-37.08278 MeVMass defect:1.068639772 u (per nucleus)Nuclear binding energy:995.43153578 MeV (per nucleus)
8.09293932 MeV (average binding energy per nucleon)Separation energy:SN = 3.00(71) MeV (first neutron)Half-life:19(2) msDecay constant λ:36.481430555787 s-1Specific activity α:1.800789455565 × 10+23 Bq g-1
4866998528554.3 Ci g-1Spin and parity:
(nuclear angular momentum)Year of discovery:2010
Radioactive Decay
Half-life T½ = 19(2) ms respectively 1.9 × 10-2 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β- | 123Rh | | 12.28(64) MeV | |
β-, n | 122Rh | ? | 6.93(58) MeV | |
β-, 2n | 121Rh | ? | | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 79) and isobaric (same nucleon number A = 123) with Ruthenium-123. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 79 | Isobar A = 123 |
44 | 123Ru | 123Ru |
45 | 124Rh | 123Rh |
46 | 125Pd | 123Pd |
47 | 126Ag | 123Ag |
48 | 127Cd | 123Cd |
49 | 128In | 123In |
50 | 129Sn | 123Sn |
51 | 130Sb | 123Sb |
52 | 131Te | 123Te |
53 | 132I | 123I |
54 | 133Xe | 123Xe |
55 | 134Cs | 123Cs |
56 | 135Ba | 123Ba |
57 | 136La | 123La |
58 | 137Ce | 123Ce |
59 | 138Pr | 123Pr |
60 | 139Nd | |
61 | 140Pm | |
62 | 141Sm | |
63 | 142Eu | |
64 | 143Gd | |
65 | 144Tb | |
66 | 145Dy | |
67 | 146Ho | |
68 | 147Er | |
69 | 148Tm | |
70 | 149Yb | |
71 | 150Lu | |
External data and identifiers
Last update: 2020-10-15
Perma link: https://www.chemlin.org/isotope/ruthenium-123
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