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Reference.org
Isotopes of antimony
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<p><a href="/facts/Antimony/YsA7lVgT">Antimony</a> (51Sb) occurs in two <a href="/facts/Stable_isotope/vgcdxgjA">stable isotopes</a>, 121Sb and 123Sb. There are 37 artificial <a href="/facts/Radioactive_isotopes/5WpCfbdq">radioactive isotopes</a>, the longest-lived of which are 125Sb, with a <a href="/facts/Half-life/kGVH8BAB">half-life</a> of 2.75856 years; 124Sb, with half-life 60.2 days; and 126Sb, with half-life 12.35 days. All other isotopes have half-lives less than 4 days, most less than an hour. There are also many <a href="/facts/Nuclear_isomer/L8DHcqnk">isomers</a>, the longest-lived of which is 120m1Sb with half-life 5.76 days. </p>