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The most stable isotope of astatine is At-210, which has a half-life of about 8.1 hours. This isotope's primary decay mode is positron emission to the relatively long-lived alpha emitter, polonium-210. In total, only five isotopes of astatine have half-lives exceeding one hour: those between 207 and 211.
(3), (4). Astatineâs Periodic Table Neighborhood. Astatine is the heaviest verified element in Group 17. Like the other halogens, it is a nonmetal, although it shows more metallic character in its chemistry than the others. Astatine and the elements on either side of it, polonium and radon, have no stable isotopes.3), (4). Astatineâs Periodic Table Neighborhood. Astatine is the heaviest verified element in Group 17. Like the other halogens, it is a nonmetal, although it shows more metallic character in its chemistry than the others. Astatine and the elements on either side of it, polonium and radon, have no stable isotopes.