Fluorine
Fluorine Flu"or*ine (fl[=u]"[o^]r*[i^]n or fl[=u]"[o^]r*[=e]n; 104), n. [NL. fluorina: cf. G. fluorin, F. fluorine. So called from its occurrence in the mineral fluorite.] (Chem.) 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. [1913 Webster]

Note: 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. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Fluorine — Fluorine, la. fluorum, meaning to flow ), is the chemical element with the symbol F and atomic number 9. Atomic fluorine is univalent and is the most chemically reactive and electronegative of all the elements. In its elementally isolated (pure)… …   Wikipedia

  • fluorine — [ flyɔrin ] n. f. • 1833; de fluor ♦ Chim. Fluorure de calcium naturel (cf. Spath fluor). On dit aussi FLUORITE . ● fluorite ou fluorine nom féminin Fluorure naturel de calcium, de formule CaF2, qui cristallise le plus souvent en cubes de teinte… …   Encyclopédie Universelle

  • fluorine — Symbol: F Atomic number: 9 Atomic weight: 18.9984 A poisonous pale yellow gaseous element belonging to group 17 of the periodic table (The halogens). It is the most chemically reactive and electronegative element. It is highly dangerous, causing… …   Elements of periodic system

  • fluorine — 1813, non metallic element, coined by English chemist Sir Humphry Davy (1778 1829) from fluorspar ( calcium fluoride, modern fluorite), the late 18c. name of the mineral where it was first found; see FLUOR (Cf. fluor) + chemical suffix INE (Cf.… …   Etymology dictionary

  • fluorine — ► NOUN ▪ a poisonous, extremely reactive, pale yellow gaseous chemical element. ORIGIN from fluor (see FLUORSPAR(Cf. ↑F)) …   English terms dictionary

  • fluorine — [flôr′ēn΄, floor′ēn] n. [ FLUOR + INE3] a corrosive, toxic, greenish yellow gaseous chemical element, one of the halogens and the most reactive nonmetallic element, forming fluorides with almost all known elements: symbol, F; at. no., 9: see the… …   English World dictionary

  • fluorine — /floor een, in, flawr , flohr /, n. Chem. the most reactive nonmetallic element, a pale yellow, corrosive, toxic gas that occurs combined, esp. in fluorite, cryolite, phosphate rock, and other minerals. Symbol: F; at. wt.: 18.9984; at. no.: 9.… …   Universalium

  • Fluorine — Fluorite Catégorie III : halogénures[1] Fluorite sur quartz Le Burg France Muséum de Toulouse …   Wikipédia en Français

  • fluorine — A gaseous chemical element, atomic no. 9, atomic wt. 18.9984032; 18F (half life of 1.83 h) is used as a diagnostic aid in various tissue scans. [L. fluere, flow] * * * fluo·rine flu̇( ə)r .ēn, ən n a nonmetal …   Medical dictionary

  • fluorine — noun a) The chemical element (symbol F) with an atomic number of 9. an octahedron of fluorines b) A fluorine atom. See Also: fluor, fluoric, fluorite …   Wiktionary

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