• Fluorine is a highly toxic pale yellow diatomic halogen gas
• Fluorine discovery by André-Marie Ampère (1810)
• Fluorine first isolated by Henri Moissan (1886)
• Fluorine named by Humphry Davy after the mineral fluorite, itself named after Latin fluo (to flow, in smelting)
• Fluorine is the most electronegative element, extremely reactive with almost all other elements, including some noble gases
• Fluorine ranks 24th in universal abundance and 13th in terrestrial abundance
• Fluorite, the primary mineral source of fluorine which gave the element its name as it was added to metal ores to lower their melting points for smelting
• Most commercial applications use fluorine compounds, with about half of mined fluorite used in steelmaking
• Fluorine combines with metals, nonmetals, metalloids, some noble gases and usually assumes an oxidation state of -1
• Fluorine's high electron affinity results in a preference for ionic bonding and when it forms covalent bonds, these are polar, and almost always single
• Carbon–fluorine forms organic chemistry's strongest bond and gives high stability to organofluorines
• Organofluorines are almost non-existent in nature, but are used in artificial compounds with many commercial applications
• Fluorocarbons (perfluorocarbons, PFCs) contain only carbon and fluorine (replacing hydrogen in hydrocarbons)
• Fluorocarbons and their derivatives are used as fluoropolymers, refrigerants, solvents, and anesthetics
• Polytetrafluoroethylene (PTFE), sometimes called by its DuPont name Teflon represents 60–80% by mass of the world's fluoropolymer production
• Hydrogen and fluorine combine to yield hydrogen fluoride which readily hydrates on contact with water to form highly corrosive hydrofluoric acid
• Fluorocarbon gases are generally greenhouse gases with global-warming potentials
• Fluorine is used in agrichemicals most of them herbicides and fungicides with a few crop regulators
• Fluorine is used in fluorosurfactants used for repelling water and stains
• Fluorides are used dental care, water fluoridation, toothpastes
• Fluorine is not essential for humans or other mammals, tiny amounts may be beneficial for teeth and bones
• Elemental fluorine and hydrofluoric acid is highly toxic and corrosive to living organisms

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