See also: List of individual Mercury isotopes (and general data sources).
General data
Name of the isotope:Mercury-187m; Hg-187mSymbol:187mHg or 187m80HgMass number A:187 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:107Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.3375 (= neutron-proton ratio)Neutron excess (N-Z):27Isotopic mass:186.969814(15) u (atomic weight of Mercury-187m)Nuclide mass:186.9259324 u (calculated nuclear mass without electrons)Mass excess:-28.11808 MeVMass defect:1.583334572 u (per nucleus)Nuclear binding energy:1474.86665381 MeV (per nucleus) 7.88698745 MeV (average binding energy per nucleon)Half-life:2.4(3) minDecay constant λ:0.0048135220872218 s-1Specific activity α:1.55039505792 × 10+19 Bq g-1 419025691.33027 Ci g-1Spin and parity: (nuclear angular momentum)13/2(+)Magnetic dipole moment:μ(μN) = - 1.044(11)Quadrupole moment Q:+0.5(3) barn (100 fm2)Nuclear g-factor:gl = -0.16061538461538
Radioactive Decay
Half-life T½ = 2.4(3) min (minutes) respectively 1.44 × 102 seconds s.
Decay mode
Daughter
Probability
Decay energy
γ energy (intensity)
α
183Pt
trace
EC/β+
187Au
>> 99 %
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 = 107) and isobaric (same nucleon number A = 187) with Mercury-187m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
