what are halogens characteristics
Halogens A halogen is one of the highly reactive elements located in group 17 of the periodic table. The halogens (in increasing atomic mass) are: fluorine, chlorine, bromine, â¦ iodine, and astatine.he halogens or halogen elements are a series of nonmetal elements from Group 17 IUPAC Style (formerly: VII, VIIA, or Group 7) of the periodic table, comprising fluorine, F; c â¦ hlorine, Cl; bromine, Br; iodine, I; and astatine, At. The undiscovered element 117, temporarily named ununseptium, may also be a halogen.