See also: List of individual Mercury isotopes (and general data sources).
General data
Name of the isotope:Mercury-172; Hg-172Symbol:172Hg or 17280HgMass number A:172 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:92Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.15 (= neutron-proton ratio)Neutron excess (N-Z):12Isotopic mass:171.99886(16) u (atomic weight of Mercury-172)Nuclide mass:171.9549784 u (calculated nuclear mass without electrons)Mass excess:-1.0619 MeVMass defect:1.424314832 u (per nucleus)Nuclear binding energy:1326.74072012 MeV (per nucleus) 7.71360884 MeV (average binding energy per nucleon)Separation energy:SN = 12.61(34) MeV (first neutron) SP = 0.79(15) MeV (first proton)Half-life:231(9) μsDecay constant λ:3000.6371452811 s-1Specific activity α:1.050603431823 × 10+25 Bq g-1 2.839468734657 × 10+14 Ci g-1Spin and parity: (nuclear angular momentum)0+Year of discovery:1999
The following table shows the atomic nuclei that are isotonic (same neutron number N = 92) and isobaric (same nucleon number A = 172) with Mercury-172. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
