See also: List of individual Platinum isotopes (and general data sources).
General data
Name of the isotope:Platinum-188; Pt-188Symbol:188Pt or 18878PtMass number A:188 (= number of nucleons)Atomic number Z:78 (= number of protons)Neutrons N:110Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.4102564102564 (= neutron-proton ratio)Neutron excess (N-Z):32Isotopic mass:187.959398(6) u (atomic weight of Platinum-188)Nuclide mass:187.9166133 u (calculated nuclear mass without electrons)Mass excess:-37.82052 MeVMass defect:1.604095256 u (per nucleus)Nuclear binding energy:1494.20510639 MeV (per nucleus) 7.9478995 MeV (average binding energy per nucleon)Separation energy:SN = 9.207(25) MeV (first neutron) SP = 5.561(28) MeV (first proton)Half-life:10.16(18) dDecay constant λ:7.896197649642 × 10-7 s-1Specific activity α:2.529908811206 × 10+15 Bq g-1 68375.913816392 Ci g-1Spin and parity: (nuclear angular momentum)0+Charge radius:5.4053(34) femtometer fmYear of discovery:1954
Radioactive Decay
Half-life T½ = 10.16(18) d respectively 8.77824 × 105 seconds s.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 110) and isobaric (same nucleon number A = 188) with Platinum-188. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
