See also: List of individual Mercury isotopes (and general data sources).
General data
Name of the isotope:Mercury-188m; Hg-188mSymbol:188mHg or 188m80HgMass number A:188 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:108Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.35 (= neutron-proton ratio)Neutron excess (N-Z):28Excitation energy:2724.1(4) keVIsotopic mass:187.967577(13) u (atomic weight of Mercury-188m)Nuclide mass:187.9236954 u (calculated nuclear mass without electrons)Mass excess:-30.20183 MeVMass defect:1.594236488 u (per nucleus)Nuclear binding energy:1485.02172315 MeV (per nucleus) 7.89905172 MeV (average binding energy per nucleon)Half-life:154(20) nsDecay constant λ:4500955.7179217 s-1Specific activity α:1.442024700241 × 10+28 Bq g-1 3.897364054706 × 10+17 Ci g-1Spin and parity: (nuclear angular momentum)12+Magnetic dipole moment:μ(μN) = -2.02(12)Quadrupole moment Q:0.91(11) barn (100 fm2)Nuclear g-factor:gl = -0.16833333333333
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 108) and isobaric (same nucleon number A = 188) with Mercury-188m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
