Symbol of Fluorine is “F”, Atomic Number is “9”, Atomic Mass is “18.998404”, and belongs to Halogen Family Group 17 (VIIA). Fluorine belongs to the Halogen Family in the ‘Periodic Table’. It is the lightest element of the ‘Halogen Family’. The Halogen Family includes Chlorine, Bromine, Iodine, and Astatine. Fluorine is the most reactive element of the Periodic Element, it even reacts with Nobel Gases at high pressure and temperature.

Fluorine gas is so dense that its color is “Pale Yellow” and density of 1.695 grams per liter. The gas is so much reactive and has a sharp smell which makes it use with proper precautions and its odor helps people to smell it quickly if there is any leakage of gas while working in the laboratory.

Fluorine is the 13th most common element present in the crust i.e. about 0.06 percent in the earth. It is used commercially as the Rocket Fuel.