A fluoride anion is a negatively charged ion (F-) that is formed when fluorine gains an electron. It is commonly found in compounds such as sodium fluoride (NaF) and calcium fluoride (CaF2).
Related terms
Hydroxide Ion: A hydroxide ion (OH-) is another example of a negatively charged ion that donates its extra electron to form bonds.
Chloride Anion: The chloride anion (Cl-) is similar to the fluoride anion but consists of chlorine instead of fluorine.
Bromide Anion: The bromide anion (Br-) is another halogen element that forms a negatively charged ion by gaining one electron.