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Halogen

The halogens are a chemical series.

They are the elements in Group 17 (old-style: VII or VIIA) of the periodic table: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At) and the as yet undiscovered ununseptium (Uus).

Note:   The above text is excerpted from the Wikipedia article "Halogen", which has been released under the GNU Free Documentation License.
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May 24, 2017

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