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Isotopes of boron
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<p><a href="/facts/Boron/Pmwgd7Mf">Boron</a> (5B) naturally occurs as <a href="/facts/Isotope/KD9B1y6o">isotopes</a> 10B and 11B, the latter of which makes up about 80% of natural boron. There are 13 <a href="/facts/Radionuclide/5WpCfbdq">radioisotopes</a> that have been discovered, with mass numbers from 7 to 21, all with short <a href="/facts/Half-life/kGVH8BAB">half-lives</a>, the longest being that of 8B, with a half-life of only 771.9(9) ms and 12B 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 <a href="/facts/Helium/yRul93TG">helium</a> (via short-lived <a href="/facts/Isotopes_of_beryllium/bNvHB5xg">isotopes of beryllium</a> for 7B and 9B) while those with mass above 11 mostly become <a href="/facts/Carbon/ukrgQexo">carbon</a>. </p>