Isotopes of antimony

Isotopes of antimony (51Sb)
Main isotopes[1] Decay
abun­dance half-life (t1/2) mode pro­duct
121Sb 57.2% stable
123Sb 42.8% stable
125Sb synth 2.7576 y β− 125Te
Standard atomic weight Ar°(Sb)

Antimony (51Sb) occurs in two stable isotopes, 121Sb and 123Sb. There are 37 artificial radioactive isotopes, the longest-lived of which are 125Sb, with a half-life 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 isomers, the longest-lived of which is 120m1Sb with half-life 5.76 days.

Except for beryllium, antimony is the lightest element observed to have isotopes capable of alpha decay; 104Sb is seen to undergo this mode of decay. Some light elements, namely those near 8Be, have isotopes with delayed alpha emission (following proton or beta emission) as a rare branch.

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