The chemical symbol for fluorine is F. It is a highly reactive and electronegative element that belongs to the halogen group in the periodic table. With an atomic number of 9, fluorine is a pale yellow-green gas at room temperature, and it exists as diatomic molecules (F2) in its elemental form. Fluorine is known for its strong oxidizing properties and high reactivity, which makes it essential in various applications, including the production of fluorinated compounds, Teflon, and pharmaceuticals. Its unique properties also pose safety concerns, requiring careful handling.