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Astatine (At), radioactive chemical element and the heaviest member of the halogen elements, or Group 17 (VIIa) of the periodic table.
Some of you will say that another element, francium (atomic number 87), is even more unstable than astatine, and you're right. As Sam writes, If you had a million atoms of the longest-lived type of astatine, half of them would disintegrate in 400 minutes. A similar sample of francium would hang on for 20 minutes.