Bismuth-204m2
Properties and data of the isotope 204Bi.
See also: list of Bismuth isotopes.
General data
Name of the isotope:Bismuth-204m2; Bi-204m2Symbol:204Bi or 20483BiMass number A:204 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:121Isotopic mass:203.977836(10) u (atomic weight of Bismuth-204m2)
Excitation energy: 2833.4(11) keVNuclide mass:203.9323091 u (calculated nuclear mass without electrons)Mass excess:-20.64563 MeVMass defect:1.720096492 u (per nucleus)Nuclear binding energy:1602.25956172 MeV (per nucleus)
7.85421354 MeV (average binding energy per nucleon)Half-life:1.07(3) msDecay constant λ:647.80110332705 s-1Specific activity α:1.921748518944 × 10+24 Bq g-1
51939149160670 Ci g-1Spin and parity:
(nuclear angular momentum)17+
Radioactive Decay
Half-life T½ = 1.07(3) ms respectively 1.07 × 10-3 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
Iso | 204Bi | 100 % | | |
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 |
---|
204Bi | | 11.22(10) h | 6+ |
204m1Bi | 805.5(3) keV | 13.0(1) ms | 10- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 121) and isobaric (same nucleon number A = 204) with Bismuth-204m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 121 | Isobar A = 204 |
73 | 194Ta | |
74 | 195W | |
75 | 196Re | |
76 | 197Os | |
77 | 198Ir | 204Ir |
78 | 199Pt | 204Pt |
79 | 200Au | 204Au |
80 | 201Hg | 204Hg |
81 | 202Tl | 204Tl |
82 | 203Pb | 204Pb |
83 | 204Bi | 204Bi |
84 | 205Po | 204Po |
85 | 206At | 204At |
86 | 207Rn | 204Rn |
87 | 208Fr | 204Fr |
88 | 209Ra | 204Ra |
89 | 210Ac | 204Ac |
90 | 211Th | |
91 | 212Pa | |
External data and identifiers
Last update: 2020-10-23
Perma link: https://www.chemlin.org/isotope/bismuth-204m2
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