See also: List of individual Platinum isotopes (and general data sources).
General data
Name of the isotope:Platinum-197; Pt-197Symbol:197Pt or 19778PtMass number A:197 (= number of nucleons)Atomic number Z:78 (= number of protons)Neutrons N:119Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.525641025641 (= neutron-proton ratio)Neutron excess (N-Z):41Isotopic mass:196.9673431(6) u (atomic weight of Platinum-197)Nuclide mass:196.9245584 u (calculated nuclear mass without electrons)Mass excess:-30.41971 MeVMass defect:1.6741344 u (per nucleus)Nuclear binding energy:1559.44614879 MeV (per nucleus) 7.9159703 MeV (average binding energy per nucleon)Separation energy:SN = 5.84656(26) MeV (first neutron) SP = 8.27(4) MeV (first proton)Half-life:19.8915(19) hDecay constant λ:9.679555764465 × 10-6 s-1Specific activity α:2.959457460838 × 10+16 Bq g-1 799853.36779419 Ci g-1Spin and parity: (nuclear angular momentum)1/2-Magnetic dipole moment:μ(μN) = 0.51(2)Nuclear g-factor:gl = 1.02Year of discovery:1936
Radioactive Decay
Half-life T½ = 19.8915(19) h (hours) respectively 7.16094 × 104 seconds s.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 119) and isobaric (same nucleon number A = 197) with Platinum-197. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
