See also: List of individual Gold isotopes (and general data sources).
General data
Name of the isotope:Gold-196m2; Au-196m2Symbol:196m2Au or 196m279AuMass number A:196 (= number of nucleons)Atomic number Z:79 (= number of protons)Neutrons N:117Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.4810126582278 (= neutron-proton ratio)Neutron excess (N-Z):38Excitation energy:595.66(4) keVIsotopic mass:195.966571(3) u (atomic weight of Gold-196m2)Nuclide mass:195.9232379 u (calculated nuclear mass without electrons)Mass excess:-31.13891 MeVMass defect:1.6654017 u (per nucleus)Nuclear binding energy:1551.31169114 MeV (per nucleus) 7.91485557 MeV (average binding energy per nucleon)Half-life:9.603(22) hDecay constant λ:2.005007638122 × 10-5 s-1Specific activity α:6.161478541994 × 10+16 Bq g-1 1665264.4708093 Ci g-1Spin and parity: (nuclear angular momentum)12-Year of discovery:1960
Radioactive Decay
Half-life T½ = 9.603(22) h (hours) respectively 3.45708 × 104 seconds s.
Decay mode
Daughter
Probability
Decay energy
γ energy (intensity)
Iso
196Au
100 %
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 117) and isobaric (same nucleon number A = 196) with Gold-196m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
