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astatine (n.)

radioactive element, named 1947, from Greek astatos "unstable" (see astatic) + chemical suffix -ine (2). So called for its short half-life and lack of stable isotopes. "The element appears not to have a stable form and probably does not exist in nature" [Flood, "Origin of Chemical Names"].

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Definitions of astatine from WordNet

astatine (n.)
a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium;
Synonyms: At / atomic number "
From wordnet.princeton.edu