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Halogen
The halogens are a chemical series of nonmetals. They are the elements in Group 17 (old-style: VII or VIIA;Group 7 IUPAC Style) of the periodic table: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At) and as yet undiscovered ununseptium (Uus).
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