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The chemical element of atomic number 17, a toxic, irritant, pale green gas.
A member of the halogen group, chlorine occurs in nature mainly as sodium chloride in seawater and salt deposits. The gas was used as a poison gas in the First World War. Chlorine is added to water supplies as a disinfectant
Early 19th century named by Sir Humphrey Davy, from Greek khlōros ‘green’ + -ine.