Nuclides with atomic number of 5 but with different mass numbers
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Isotopes of boron (5B)
Main isotopes
Decay
abundance
half-life (t1/2)
mode
product
8B
synth
771.9 ms
β+
8Be
10B
19.6%
stable
11B
80.3%
stable
Standard atomic weight Ar°(B)
[10.806, 10.821][1]
10.81±0.02 (abridged)[2]
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Boron (5B) naturally occurs as isotopes 10 B and 11 B , the latter of which makes up about 80% of natural boron. There are 13 radioisotopes that have been discovered, with mass numbers from 7 to 21, all with short half-lives, the longest being that of 8 B , with a half-life of only 771.9(9) ms and 12 B with a half-life of 20.20(2) ms. All other isotopes have half-lives shorter than 17.35 ms. Those isotopes with mass below 10 decay into helium (via short-lived isotopes of beryllium for 7 B and 9 B ) while those with mass above 11 mostly become carbon.
A chart showing the abundances of the naturally occurring isotopes of boron.
^"Standard Atomic Weights: Boron". CIAAW. 2009.
^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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