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astatine

   Also found in: Medical, Financial, Acronyms, Encyclopedia, Wikipedia, Hutchinson 0.02 sec.
as·ta·tine  (st-tn, -tn)
n. Symbol At
A highly unstable radioactive element, the heaviest of the halogen series, that resembles iodine in solution. Its longest lived isotope has a mass number of 210 and 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. See Table at element.

[Greek astatos, unstable; see astasia + -ine2.]

astatine
Noun
Chem a radioactive element occurring naturally in minute amounts or artificially produced by bombarding bismuth with alpha particles Symbol: At[Greek astatos unstable]

astatine  (st-tn)
Symbol At
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. See Periodic Table.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.astatine - a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
halogen - any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions

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Though Argonne provides him the tiny amounts of astatine he needs for in-house work, Atcher says, one of his colleagues at the University of Pittsburgh could never get enough astatine to prove or disprove the therapy's potential" -- even though he had a grant for a human trial.
A Tin (Sn) B Boron (B) C Astatine (At) D Arsenic (As) 4.
 
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