Meaning of ATOMIC NUMBER 17

WordNet Dictionary
	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)
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	Synonyms:		chlorine, Cl
	See Also:		chemical element, common salt, element, gas, halogen, radiochlorine, sodium chloride