The chemical formula for fluoride is F–. This indicates that fluoride is an ion of the element fluorine, which has the atomic number 9. In its ionic form, fluorine gains an additional electron to become negatively charged, thus forming the fluoride ion.
Fluoride is commonly found in many compounds, such as sodium fluoride (NaF) and calcium fluoride (CaF2). These compounds are often used in dental applications to help prevent tooth decay, as fluoride can strengthen tooth enamel. Understanding the chemical formula is essential for identifying the properties and uses of fluoride in various contexts.