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**Symbol:** Cl
**Atomic number:** 17
**International title:** Chlorine
**General formula:** Clâ‚‚
**Relative Atomic Weight:** 35,453
**Information:** Chlorine is a toxic, yellow-green gas and form a two-atom molecule as well as other halogens.
**Use:** It is used as a raw material in the chemical industry (mainly in the production of plastics, insecticides, hydrochloric acid). Chlorine is used to disinfect drinking water and to produce disinfectants (eg. bleach).
**Occurrence:** On Earth, chlorine occurs only in the form of compounds. The most important chlorine mineral is halite or NaCl cooking salt. Chlorine is a biogenic element.