astatine

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as·ta·tine

 (ăs′tə-tēn′, -tĭn)
n. Symbol At
A highly unstable radioactive element, the heaviest of the halogen group, 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 Periodic Table.

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

astatine

(ˈæstəˌtiːn; -tɪn)
n
(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)
[C20: from Greek astatos unstable (see astatic) + -ine2]

as•ta•tine

(ˈæs təˌtin -tɪn)

n.
a rare element of the halogen family. Symbol: At; at. no.: 85.
[1945–50; < Greek ástat(os) unstable + -ine2]

as·ta·tine

(ăs′tə-tēn′)
Symbol At A highly unstable, radioactive element that is the heaviest of the halogen elements. The most stable of its many isotopes has a half-life of only about eight hours. Atomic number 85. See Periodic Table.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.astatine - a highly unstable radioactive element (the heaviest of the halogen series)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
Translations
astat
astat
astaat
astatiini
astate
astat
asztácium
astat
アスタチン
astatium
astatinas
astat
astat
astato
astatin
astat
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астат
astatin
References in periodicals archive ?
If this situation appeared on the board, and your rack was AABILMN, you could make ALABAMINE in the middle, forming a 9 x 3 rectangle with all words allowed (in World Scrabble), and the move 'touching' 16 different letters.
He notes that Webster's Third lists additional variant names for elements such as ALABAMINE, MASURIUM, VIRGINIUM, EKA-CESIUM and DVI-MANGANESE, not to mention the well-known QUICKSILVER.