See also: List of individual Bismuth isotopes (and general data sources).
General data
Name of the isotope:Bismuth-199; Bi-199Symbol:199Bi or 19983BiMass number A:199 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:116Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.3975903614458 (= neutron-proton ratio)Neutron excess (N-Z):33Isotopic mass:198.977673(11) u (atomic weight of Bismuth-199)Nuclide mass:198.9321461 u (calculated nuclear mass without electrons)Mass excess:-20.79747 MeVMass defect:1.676934912 u (per nucleus)Nuclear binding energy:1562.05480892 MeV (per nucleus) 7.84952165 MeV (average binding energy per nucleon)Separation energy:SN = 9.50(3) MeV (first neutron) SP = 2.019(14) MeV (first proton)Half-life:27(1) minDecay constant λ:0.00042786862997527 s-1Specific activity α:1.294961930979 × 10+18 Bq g-1 34998971.107562 Ci g-1Spin and parity: (nuclear angular momentum)9/2-Magnetic dipole moment:μ(μN) = 4.6(4)Nuclear g-factor:gl = 1.0222222222222Year of discovery:1950
Radioactive Decay
Half-life T½ = 27(1) min (minutes) respectively 1.620 × 103 seconds s.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 116) and isobaric (same nucleon number A = 199) with Bismuth-199. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
