Halogens are a group of elements found in the periodic table that include Fluorine (8 letters), CHLORINE (8 letters), Astatine (8 letters), Iodine (6 letters) and BROMINE (7 letters). These elements are characterized by having seven electrons in their outermost shell, which makes them highly reactive. They are used in a variety of applications, such as in the production of pharmaceuticals, dyes, and plastics. Halogens are also used in the production of halogen lamps, which are used for lighting.