Fluorine is a chemical element with the symbol F and it has the atomic number of 9. It is extremely reactive with almost all elements, including some noble gases to form compounds that form compounds with the element, and it ranks as the 24th in abundance, as the mineral Fluorite is the primary source of all fluorite on earth, and it was described in 1529, added to metal ores to lower their melting points for use in smelting, and it has plenty of industrial uses. Several early experimenters died or sustained injuries from their attempts, but in 1886, a French chemist managed to isolate fluoride from the ore.
There are medical usages of fluorine, such as in dentistry, where it is used to protect the enamel from rotting due to plaque and tartar. Sodium fluoride is used to properly clean and whiten teeth.