See also: List of individual Osmium isotopes (and general data sources).
General data
Name of the isotope:Osmium-169; Os-169Symbol:169Os or 16976OsMass number A:169 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:93Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.2236842105263 (= neutron-proton ratio)Neutron excess (N-Z):17Isotopic mass:168.967018(27) u (atomic weight of Osmium-169)Nuclide mass:168.9253302 u (calculated nuclear mass without electrons)Mass excess:-30.72254 MeVMass defect:1.43352162 u (per nucleus)Nuclear binding energy:1335.3167879 MeV (per nucleus) 7.90128277 MeV (average binding energy per nucleon)Separation energy:SN = 8.799(27) MeV (first neutron) SP = 2.22(4) MeV (first proton)Half-life:3.43(14) sDecay constant λ:0.20208372611077 s-1Specific activity α:7.202450859044 × 10+20 Bq g-1 19466083402.824 Ci g-1Spin and parity: (nuclear angular momentum)(5/2-)Year of discovery:1972
The following table shows the atomic nuclei that are isotonic (same neutron number N = 93) and isobaric (same nucleon number A = 169) with Osmium-169. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
