#chlorine__Cl__atomic_number_17  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)
  supertype:  chemical_element  gas
  substance of:  sodium_chloride
  subtype:  radiochlorine  a radioactive isotope of chlorine

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