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1 definition found
 for atomic number 19
From WordNet (r) 3.0 (2006) :

  atomic number 19
      n 1: a light soft silver-white metallic element of the alkali
           metal group; oxidizes rapidly in air and reacts violently
           with water; is abundant in nature in combined forms
           occurring in sea water and in carnallite and kainite and
           sylvite [syn: potassium, K, atomic number 19]

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