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English Dictionary: atomic number 2 by the DICT Development Group
1 result for atomic number 2
From WordNet (r) 3.0 (2006) [wn]:
atomic number 2
n
  1. a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas)
    Synonym(s): helium, He, atomic number 2
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