Bismuth-222
Properties and data of the isotope 222Bi.
See also: List of individual Bismuth isotopes (and general data sources).
General data
Name of the isotope:Bismuth-222; Bi-222Symbol:222Bi or 22283BiMass number A:222 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:139Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.6746987951807 (= neutron-proton ratio)Neutron excess (N-Z):56Isotopic mass:222.03084(32) u (atomic weight of Bismuth-222)Nuclide mass:221.9853131 u (calculated nuclear mass without electrons)Mass excess:28.72727 MeVMass defect:1.82306098 u (per nucleus)Nuclear binding energy:1698.1703645 MeV (per nucleus)
7.64941606 MeV (average binding energy per nucleon)Separation energy:SN = 3.44(42) MeV (first neutron)Half-life:300 nsDecay constant λ:2310490.6018665 s-1Specific activity α:6.267612549549 × 10+27 Bq g-1
1.693949337716 × 10+17 Ci g-1Spin and parity:
(nuclear angular momentum)Year of discovery:2009
Radioactive Decay
Half-life T½ = 300 ns respectively 3.0 × 10-7 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 222Po | ? | 6.24(30) MeV | |
| β-, n | 221Po | ? | 0.88(30) MeV | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 139) and isobaric (same nucleon number A = 222) with Bismuth-222. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 139 | Isobar A = 222 |
|---|
| 83 | 222Bi | 222Bi |
| 84 | 223Po | 222Po |
| 85 | 224At | 222At |
| 86 | 225Rn | 222Rn |
| 87 | 226Fr | 222Fr |
| 88 | 227Ra | 222Ra |
| 89 | 228Ac | 222Ac |
| 90 | 229Th | 222Th |
| 91 | 230Pa | 222Pa |
| 92 | 231U | 222U |
| 93 | 232Np | 222Np |
| 94 | 233Pu | |
| 95 | 234Am | |
| 96 | 235Cm | |
| 97 | 236Bk | |
| 98 | 237Cf | |
Literature and References
[1] - H. Alvarez-Pol, J. Benlliure, E. Casarejos, L. Audouin et al.:
Production cross-sections of neutron-rich Pb and Bi isotopes in the fragmentation of 238U.
In: Experimental Physics, (2009), DOI 10.1140/epja/i2009-10856-8.
Last update: 2020-10-23
Perma link: https://www.chemlin.org/isotope/bismuth-222
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