The element fluorine is classified in the halogen group on the periodic table. Halogens are nonmetallic elements, and all of them have seven electrons in their outer shells.
Fluorine is extremely reactive and cannot be chemically separated from a compound.
The name fluorine originates from "fluere," the Latin and French word for "flow."
There are total of five elements in the halogen group. The other elements included are chlorine, bromine, iodine and astatine. These five elements exist in different states of matter at room temperature. Iodine and astatine exist as solids; bromine is in the liquid state; and fluorine and chlorine are in a gaseous state.