This page disambiguates a two-character combination which might be any or all of: an abbreviation, an acronym, an initialism, a word in English, or a word in another language. If an article link referred you to this page, you may wish to change the link to point directly to the intended article.
It is a halogen, found in the periodic table in group 17.
The pure chemical element, has the physical form of a diatomic yellow-green gas, Cl This element is a member of the salt-forming halogen series and is extracted from chlorides through oxidation and more commonly, by electrolysis.
Cl-36 is produced in the atmosphere by spallation of Ar-36 by interactions with cosmic ray protons.