Astatine Definition
ăstə-tēn, -tĭn
noun
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.
American Heritage
A radioactive chemical element, one of the halogens, formed from bismuth when it is bombarded by alpha particles: it resembles iodine in its chemical properties: symbol, At; at. no. 85
Webster's New World
A highly radioactive chemical element (symbol At), one of the halogens, with atomic number 85.
Wiktionary
Synonyms:
- atomic number 85
- at
Origin of Astatine
From Ancient Greek ἄστατος (astatos, “unstable”) + -ine.
From Wiktionary
-
Greek astatos unstable astasia –ine
From American Heritage Dictionary of the English Language, 5th Edition
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