See also: List of individual Bismuth isotopes (and general data sources).
General data
Name of the isotope:Bismuth-210m; Bi-210mOther names:Radium ESymbol:210mBi or 210m83BiMass number A:210 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:127Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.5301204819277 (= neutron-proton ratio)Neutron excess (N-Z):44Excitation energy:271.31(11) keVIsotopic mass:209.9841202(15) u (atomic weight of Bismuth-210m)Nuclide mass:209.9385933 u (calculated nuclear mass without electrons)Mass excess:-14.79194 MeVMass defect:1.765801788 u (per nucleus)Nuclear binding energy:1644.83377071 MeV (per nucleus) 7.83254177 MeV (average binding energy per nucleon)Half-life:3.04(6) × 106 yearsDecay constant λ:7.230116088713 × 10-15 s-1Specific activity α:20735271.198556 Bq g-1 0.00056041273509611 Ci g-1Spin and parity: (nuclear angular momentum)9-Magnetic dipole moment:μ(μN) = 2.728(42)Quadrupole moment Q:0.66(7) barn (100 fm2)Nuclear g-factor:gl = 0.30311111111111
Radioactive Decay
Half-life T½ = 3.04(6) × 106 years respectively 9.586944 × 1013 seconds s.
Decay mode
Daughter
Probability
Decay energy
γ energy (intensity)
α
210Tl
100 %
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 = 127) and isobaric (same nucleon number A = 210) with Bismuth-210m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
