Examples from the Web for fluorine
The preparation of fluorine was finally accomplished by the French chemist Moissan by the electrolysis of hydrofluoric acid.
Aqueous potash does not form potassium hypofluorite when fluorine is bubbled into it, but only potassium fluoride.
There was a big one on Nifflheim, armored against the fluorine atmosphere and the hydrofluoric-acid rains.The Cosmic Computer|Henry Beam Piper
Oxygen will combine with iron or lead or sodium, but cannot be made to combine with fluorine.The Machinery of the Universe|Amos Emerson Dolbear
Fluorspar has already been mentioned as the chief natural compound of fluorine.