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1 definition found
 for atomic number 7
From WordNet (r) 3.0 (2006) :

  atomic number 7
      n 1: a common nonmetallic element that is normally a colorless
           odorless tasteless inert diatomic gas; constitutes 78
           percent of the atmosphere by volume; a constituent of all
           living tissues [syn: nitrogen, N, atomic number 7]

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