See also: List of individual Antimony isotopes (and general data sources).
General data
Name of the isotope:Antimony-125; Sb-125Symbol:125Sb or 12551SbMass number A:125 (= number of nucleons)Atomic number Z:51 (= number of protons)Neutrons N:74Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.4509803921569 (= neutron-proton ratio)Neutron excess (N-Z):23Isotopic mass:124.9052530(28) u (atomic weight of Antimony-125)Nuclide mass:124.8772771 u (calculated nuclear mass without electrons)Mass excess:-88.25626 MeVMass defect:1.135027416 u (per nucleus)Nuclear binding energy:1057.27122784 MeV (per nucleus) 8.45816982 MeV (average binding energy per nucleon)Separation energy:SN = 8.7073(21) MeV (first neutron) SP = 7.3110(26) MeV (first proton)Half-life:2.75856(25) yearsDecay constant λ:7.96776322055 × 10-9 s-1Specific activity α:38415511360856 Bq g-1 1038.2570638069 Ci g-1Spin and parity: (nuclear angular momentum)7/2+Magnetic dipole moment:μ(μN) = + 2.63(4)Nuclear g-factor:gl = 0.75142857142857Year of discovery:1951
Radioactive Decay
Half-life T½ = 2.75856(25) years respectively 8.699394816 × 107 seconds s.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 74) and isobaric (same nucleon number A = 125) with Antimony-125. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
