See also: List of individual Mercury isotopes (and general data sources).
General data
Name of the isotope:Mercury-206; Hg-206Symbol:206Hg or 20680HgMass number A:206 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:126Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.575 (= neutron-proton ratio)Neutron excess (N-Z):46Isotopic mass:205.977514(22) u (atomic weight of Mercury-206)Nuclide mass:205.9336324 u (calculated nuclear mass without electrons)Mass excess:-20.94557 MeVMass defect:1.740267976 u (per nucleus)Nuclear binding energy:1621.04917804 MeV (per nucleus) 7.86917077 MeV (average binding energy per nucleon)Separation energy:SN = 6.729(21) MeV (first neutron) SP = 9.46(20) MeV (first proton)Half-life:8.32(7) minDecay constant λ:0.0013885159866986 s-1Specific activity α:4.059588135144 × 10+18 Bq g-1 109718598.24715 Ci g-1Spin and parity: (nuclear angular momentum)0+Charge radius:5.4837(40) femtometer fmYear of discovery:1961
Radioactive Decay
Half-life T½ = 8.32(7) min (minutes) respectively 4.992 × 102 seconds s.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 126) and isobaric (same nucleon number A = 206) with Mercury-206. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
