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English Dictionary: atomic number 9 by the DICT Development Group
1 result for atomic number 9
From WordNet (r) 3.0 (2006) [wn]:
atomic number 9
n
  1. a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite
    Synonym(s): fluorine, F, atomic number 9
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