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Chlorine The element chlorine is a Halogen. The atomic number is 17 and the symbol is Cl. It has an atomic mass of 35.4527 g. It also is in the third period and group 17. Chlorine is a non-metallic gas. It has a yellowish green color. The boiling point of chlorine is -36.6 C or -30.279 F. The melting point is -100.98 C or -149.964 F. The electron configuration is (Ne)3s 3p. Chlorine is a respiratory irritant. The liquid burns the skin and the gas irritates the mucous membranes. After a few deep breaths of 1000ppm of chlorine, can be fatal. In 1915 it was used as a war gas. Chlorine is not f