See also: List of individual Mercury isotopes (and general data sources).
General data
Name of the isotope:Mercury-177m; Hg-177mSymbol:177mHg or 177m80HgMass number A:177 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:97Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.2125 (= neutron-proton ratio)Neutron excess (N-Z):17Excitation energy:323.2(12) keVIsotopic mass:176.98628(8) u (atomic weight of Mercury-177m)Nuclide mass:176.9423984 u (calculated nuclear mass without electrons)Mass excess:-12.7801 MeVMass defect:1.480219412 u (per nucleus)Nuclear binding energy:1378.81550096 MeV (per nucleus) 7.78991808 MeV (average binding energy per nucleon)Half-life:1.50(15) μsDecay constant λ:462098.1203733 s-1Specific activity α:1.572336525644 × 10+27 Bq g-1 4.249558177417 × 10+16 Ci g-1Spin and parity: (nuclear angular momentum)13/2+
The following table shows the atomic nuclei that are isotonic (same neutron number N = 97) and isobaric (same nucleon number A = 177) with Mercury-177m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
