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astatine |
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astatine [ˈæstəˌtiːn -tɪn] n (Chemistry / Elements & Compounds) a radioactive element of the halogen series: a decay product of uranium and thorium that occurs naturally in minute amounts and is artificially produced by bombarding bismuth with alpha particles. Symbol: At; atomic no.: 85; half-life of most stable isotope, 210At: 8.1 hours; probable valency: 1,3,5, or 7; melting pt.: 302°C; boiling pt.: 337°C (est.) [from Greek astatos unstable (see astatic) + -ine2]
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