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1 definition found
 for atomic number 17
From WordNet (r) 3.0 (2006) :

  atomic number 17
      n 1: a common nonmetallic element belonging to the halogens;
           best known as a heavy yellow irritating toxic gas; used to
           purify water and as a bleaching agent and disinfectant;
           occurs naturally only as a salt (as in sea water) [syn:
           chlorine, Cl, atomic number 17]

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