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English Dictionary: atomic number 18 by the DICT Development Group
1 result for atomic number 18
From WordNet (r) 3.0 (2006) [wn]:
atomic number 18
n
  1. a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
    Synonym(s): argon, Ar, atomic number 18
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