See also: List of individual Tantalum isotopes (and general data sources).
General data
Name of the isotope:Tantalum-158; Ta-158Symbol:158Ta or 15873TaMass number A:158 (= number of nucleons)Atomic number Z:73 (= number of protons)Neutrons N:85Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.1643835616438 (= neutron-proton ratio)Neutron excess (N-Z):12Isotopic mass:157.96654(21) u (atomic weight of Tantalum-158)Nuclide mass:157.9264976 u (calculated nuclear mass without electrons)Mass excess:-31.16779 MeVMass defect:1.341205196 u (per nucleus)Nuclear binding energy:1249.32459284 MeV (per nucleus) 7.90711768 MeV (average binding energy per nucleon)Separation energy:SN = 9.64(25) MeV (first neutron)Half-life:55(15) msDecay constant λ:12.602676010181 s-1Specific activity α:4.804504098525 × 10+22 Bq g-1 1298514621223 Ci g-1Spin and parity: (nuclear angular momentum)(2-)Year of discovery:1979
Radioactive Decay
Half-life T½ = 55(15) ms respectively 5.5 × 10-2 seconds s.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 85) and isobaric (same nucleon number A = 158) with Tantalum-158. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
