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Isotopes

Antimony has two stable isotopes: Sb with a natural abundance of 57.36% and Sb with a natural abundance of 42.64%. It also has 35 radioisotopes, of which the longest-lived is Sb with a half-life of 2.75 years. In addition, 29 metastable states have been characterized. The most stable of these is Sb with a half-life of 5.76 days. Isotopes that are lighter than the stable Sb tend to decay by β decay, and those that are heavier tend to decay by β decay, with some exceptions. Antimony is the lightest element to have an isotope with an alpha decay branch, excluding Be and other light nuclides with beta-delayed alpha emission.