Isotopes of boron

Isotopes of boron (5B)
Main isotopes Decay
Isotope abun­dance half-life (t1/2) mode pro­duct
8B synth 771.9 ms β+ 8Be
10B [18.9%, 20.4%]
Preview warning: Infobox B isotopes: Abundance percentage not recognised "na=[18.9%, 20.4%]" cat#%
 stable
11B [79.6%, 81.1%]
Preview warning: Infobox B isotopes: Abundance percentage not recognised "na=[79.6%, 81.1%]" cat#%
 stable
Standard atomic weight Ar°(B)
  • [10.806, 10.821]
  • 10.81±0.02 (abridged)

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 while those with mass above 11 mostly become carbon.

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