See also: List of individual Antimony isotopes (and general data sources).
General data
Name of the isotope:Antimony-126; Sb-126Symbol:126Sb or 12651SbMass number A:126 (= number of nucleons)Atomic number Z:51 (= number of protons)Neutrons N:75Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.4705882352941 (= neutron-proton ratio)Neutron excess (N-Z):24Isotopic mass:125.90725(3) u (atomic weight of Antimony-126)Nuclide mass:125.8792741 u (calculated nuclear mass without electrons)Mass excess:-86.39607 MeVMass defect:1.141695332 u (per nucleus)Nuclear binding energy:1063.48235159 MeV (per nucleus) 8.44033612 MeV (average binding energy per nucleon)Separation energy:SN = 6.21(3) MeV (first neutron) SP = 7.79(3) MeV (first proton)Half-life:12.35(6) dDecay constant λ:6.49598122432 × 10-7 s-1Specific activity α:3.107026267921 × 10+15 Bq g-1 83973.682916803 Ci g-1Spin and parity: (nuclear angular momentum)(8-)Magnetic dipole moment:μ(μN) = 1.28(7)Nuclear g-factor:gl = 0.16Year of discovery:1956
Radioactive Decay
Half-life T½ = 12.35(6) d respectively 1.067040 × 106 seconds s.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 75) and isobaric (same nucleon number A = 126) with Antimony-126. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
