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  • Elements

    18.9984032 (5)

    Name: fluorineGroup number: 17
    Symbol: FGroup name: Halogen
    Atomic number: 9Period number: 2
    Atomic weight: 18.9984032 (5)Block: p-block
    CAS Registry ID: 7782-41-4Voice:
    Standard state: gas at 298 KColour: pale yellow
    Classification: Non-metallicAvailability:

    simulated image of fluorine gas
    This sample is from The Elements Collection, an attractive and safely packaged collection of the 92 naturally occurring elements that is available for sale.

    Fluorine is a Group 17 element. Fluorine is the most electronegative and reactive of all elements. It is a pale yellow, corrosive gas, which reacts with practically all organic and inorganic substances. Finely divided metals, glass, ceramics, carbon, and even water burn in fluorine with a bright flame.Until World War 2, there was no commercial production of elemental fluorine. Atom bomb projects and nuclear energy applications made it necessary to produce large quantities of fluorine since isotopes of uranium can be separated through the gas diffusion of UF6. Reasonably safe handling techniques for fluorine are now available and one can transport liquid fluorine by the ton. Compounds of fluorine with noble gases such as xenon, radon, and krypton are known. Elemental fluorine and the fluoride ion (in quantity) are highly toxic.

    Nearing Zero cartoon for fluorine
    Nearing Zero cartoon included by kind permission of Nick Kim.


    Here is a brief summary of the isolation of fluorine.

    It would never be necessary to make fluorine gas in most laboratories. Fluorine is available commercially in cylinders but is very difficult to handle. Fluorine may be recovered with difficulty as a highly reactive and corrosive pale yellow gas by electrolysis of hot molten mixtures (1:2) of potassium fluoride (KF) and hydrogen fluoride (HF). The electrolyte is corrosive, so is the product. Grease must be avoided because of the fire hazard. It is difficult to store as it reacts with most materials but steel and Monel metal containers may be used as the metal surfaces deactivate through the formation of unreactive surface fluorides.

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    Our data and resources are taken from Web Elements