chlorine

element 17|bertholite

Chlorine

chemical element with symbol Cl and atomic number 17

Chlorine liquid in an ampoule.jpg

Cl

Chemical element with atomic number 17 (Cl)

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Chlorine is a chemical element; it has symbol Cl and atomic number 17. The second-lightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them. Chlorine is a yellow-green gas at room temperature. It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity on the revised Pauling scale, behind only oxygen and fluorine.

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Chlorine

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