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astatine

[ as-tuh-teen, -tin ]

noun

, Chemistry.
  1. a rare element of the halogen family. : At; : 85.


astatine

/ -tɪn; ˈæstəˌtiːn /

noun

  1. 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)


astatine

/ ăstə-tēn′ /

  1. A highly unstable, rare, radioactive element that is the heaviest of the halogen elements. Its most stable isotope has a half-life of 8.3 hours. Atomic number 85; melting point 302°C; boiling point 337°C; valence probably 1, 3, 5, 7.


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Word History and Origins

Origin of astatine1

1945–50; < Greek ástat ( os ) not steadfast, unstable ( astatic ) + -ine 2
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Word History and Origins

Origin of astatine1

C20: from Greek astatos unstable (see astatic ) + -ine ²

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astatideAstbury