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Definitions for
"Astatine"
Keywords:
heaviest
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halogen
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uranium
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decay
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thorium
a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
wordnet.princeton.edu
Astatine (IPA: ) is a chemical element in the periodic table that has the symbol At and atomic number 85. This radioactive element occurs naturally from uranium-235 and uranium-238 decay; it is the heaviest of the halogens.
en.wikipedia.org