fluorine
NounOpen English WordNet
Noun (1)
- a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatiteSynonyms: Fatomic number 9Type of chemical element, gas, halogenSubstance of cryolite, fluorapatite, fluorite
What does it mean? Question 1 of today’s quiz
Webster's Dictionary (1913)
Origin: NL. fluorina: cf. G. fluorin, F. fluorine. So called from its occurrence in the mineral fluorite.
Chemistry A non-metallic, gaseous element of atomic number 9, strongly acid or negative, and associated with chlorine, bromine, and iodine, in the halogen group of which it is the first member. It always occurs combined, is very active chemically, and possesses such an avidity for most elements, and silicon especially, that it can neither be prepared nor kept in glass vessels, but may be contained in lead vessels. If set free it immediately attacks a containing glass vessel, so that it was not isolated until 1886. It is a pungent, corrosive, colorless gas. Symbol F. Atomic weight 19.00.
☞ Fluorine unites with hydrogen to form hydrofluoric acid, which is the agent employed in etching glass. It occurs naturally, principally combined as calcium fluoride in fluorite, and as a double fluoride of aluminium and sodium in cryolite.
Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54