Chlorine
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Chlorine is a chemical element, having the chemical symbol Cl.
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Its atomic number (the number of protons) is 17. It has a Standard Atomic Weight of 35.453(2), and is typically found as a gas in its elemental form.
Chlorine is considered to be a member of the "Halogen" class of elements, has a boiling point of -34.04 °C , and a melting point of -101.5 °C .