Bismuth-206
Properties and data of the isotope 206Bi.
See also: list of Bismuth isotopes.
General data
Name of the isotope:Bismuth-206; Bi-206Symbol:206Bi or 20683BiMass number A:206 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:123Isotopic mass:205.978499(8) u (atomic weight of Bismuth-206)Nuclide mass:205.9329721 u (calculated nuclear mass without electrons)Mass excess:-20.02805 MeVMass defect:1.736763324 u (per nucleus)Nuclear binding energy:1617.78461573 MeV (per nucleus)
7.85332338 MeV (average binding energy per nucleon)Separation energy:SN = 7.035(9) MeV (first neutron)
SP = 3.547(8) MeV (first proton)Half-life:6.243(3) dDecay constant λ:1.285045140483 × 10-6 s-1Specific activity α:3.774986754813 × 10+15 Bq g-1
102026.669049 Ci g-1Spin and parity:
(nuclear angular momentum)6+Magnetic dipole moment:μ(μN) = + 4.361(8)Quadrupole moment Q:-0.39(4) barn (100 fm2)Nuclear g-factor:gl = 0.72683333333333Charge radius:5.5034(909) femtometer fmYear of discovery:1947
Radioactive Decay
Half-life T½ = 6.243(3) d respectively 5.393952 × 105 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EC/β+ | 206Pb | 100 % | 3.757(8) MeV | |
Parent Nuclides
Direct parent isotopes are: 210At, 206Po.
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
Nuclear Isomer | Excitation Energy | Half-life | Spin |
---|
206mBi | 1044.8(7) keV | 0.89(1) ms | 10- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 123) and isobaric (same nucleon number A = 206) with Bismuth-206. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 123 | Isobar A = 206 |
74 | 197W | |
75 | 198Re | |
76 | 199Os | |
77 | 200Ir | |
78 | 201Pt | 206Pt |
79 | 202Au | 206Au |
80 | 203Hg | 206Hg |
81 | 204Tl | 206Tl |
82 | 205Pb | 206Pb |
83 | 206Bi | 206Bi |
84 | 207Po | 206Po |
85 | 208At | 206At |
86 | 209Rn | 206Rn |
87 | 210Fr | 206Fr |
88 | 211Ra | 206Ra |
89 | 212Ac | 206Ac |
90 | 213Th | |
91 | 214Pa | |
92 | 215U | |
External data and identifiers
Last update: 2020-10-23
Perma link: https://www.chemlin.org/isotope/bismuth-206
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