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2 definitions found
 for astatine
From WordNet (r) 3.0 (2006) :

      n 1: a highly unstable radioactive element (the heaviest of the
           halogen series); a decay product of uranium and thorium
           [syn: astatine, At, atomic number 85]

From The Elements (07Nov00) :

  Symbol: At
  Atomic number: 85
  Atomic weight: (210)
  Radioactive halogen element. Occurs naturally from uranium and thorium
  decay. At least 20 known isotopes. At-210, the most stable, has a
  half-life of 8.3 hours. Synthesized by nuclear bombardment in 1940 by
  Corson, K.R. MacKenzie and E. Segre at the University of California.

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