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atomic number 17

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 Definition: [n]  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)
 
 Synonyms: chlorine, Cl
 
 See Also: chemical element, common salt, element, gas, halogen, radiochlorine, sodium chloride

 

 

 

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