Nuclides with atomic number of 33 but with different mass numbers
Isotopes of arsenic (33As)
Main isotopes[1]
Decay
abundance
half-life (t1/2)
mode
product
73As
synth
80.3 d
ε
73Ge
γ
–
74As
synth
17.8 d
ε
74Ge
β+
74Ge
γ
–
β−
74Se
75As
100%
stable
Standard atomic weight Ar°(As)
74.921595±0.000006[2]
74.922±0.001 (abridged)[3]
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Arsenic (33As) has 32 known isotopes and at least 10 isomers. Only one of these isotopes, 75As, is stable; as such, it is considered a monoisotopic element. The longest-lived radioisotope is 73As with a half-life of 80 days.
^Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
^"Standard Atomic Weights: Arsenic". CIAAW. 2013.
^Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
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