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may as well list them all
A [[halogen]] is any element that sits in column 17 of the periodic table. One example of a halogen is [[chlorine]].
A [[halogen]] is any element that sits in column 17 of the periodic table. The known halogens are [[fluourine]], [[chlorine]], [[bromine]], [[iodine]] and the extremely rare and unstable [[astatine]].
[[Category:Elements]]
[[Category:Elements]]