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n. 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.

n. A highly radioactive chemical element (symbol At), one of the halogens, with atomic number 85.

n. a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium

"The other halogens are: fluorine, an extremely reactive gas; chlorine, a reactive, heavy gas; iodine, a relatively inactive solid; and astatine."

chemical element    element    halogen   

eka-astatine    astatane