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Definition of: astatine
(as′tə·tēn, -tin) noun
An unstable element (symbol At, atomic number 85) belonging to the halogen group, produced by bombarding bismuth with alpha particles, the most stable isotope having mass number 210 and a half-life of 8.3 hours. See PERIODIC TABLE. [<Gk. astatos unstable + -INE2]
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