atomic number 17

1 definition found

atomic number 17 - WordNet (r) 2.1 (2005) :

  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]