F⁻
Fluoride
F⁻ is the chemical formula for the fluoride ion. This ion is the anion (negatively charged ion) of the element fluorine (F), which is a halogen. Fluoride is a monoatomic ion that has a charge of -1 because it has gained one electron in its outermost orbital.
In solution, fluoride ions can interact with cations (positively charged ions) to form ionic compounds. For example, when fluoride ions react with calcium cations (Ca²⁺) in the body, they form calcium fluoride (CaF₂), which is an insoluble compound. This is why fluoride is often added to drinking water as a way to prevent tooth decay, as calcium fluoride helps to protect tooth enamel.
In general, fluoride is an important element in both biological and industrial settings. It is also a highly reactive and corrosive element, which makes it useful in a variety of chemical processes.
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