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n. rare radioactive element (Chemistry)

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Astatine is a very rare radioactive chemical element with the chemical symbol At and atomic number 85. It occurs on Earth as the decay product of various heavier elements. All its isotopes are short-lived; the most stable is astatine-210, with a half-life of 8.1 hours. Elemental astatine has never been viewed because any macroscopic sample would be immediately vaporized by its radioactive heating. It has yet to be determined if this obstacle could be overcome with sufficient cooling.

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1. a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
(synonym) At, atomic number 85
(hypernym) chemical element, element

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n. astat

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Astatine (At)
Atomic Mass : 210
Atomic Number : 85
Name Origins : Greek, astatos = "unstable."
Year Discovered :
Discovery Credits : Produced by D. R. Corson, K. R. Mackenzie, and E. Segre at the University of California, USA.
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