The most stable isotope of astatine is 210 which has a half-life of 8.1 hours. Astatine 211 is the product and has a half-life of 7.2 hours. The element can be produced by bombarding targets made of bismuth-209 with high energy alpha particles (helium nuclei). It is radioactive and its name, from the Greek astatos, means "unstable".
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