Halogen
Halogen
The halogens or halogen elements are a series of nonmetal elements from Group 17 IUPAC Style (formerly VII, VIIA) of the periodic table, comprising fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). The artificially created element 117, provisionally referred to by the systematic name ununseptium, may also be a halogen.