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fluorine
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English Dictionary: fluorine by the DICT Development Group
3 results for fluorine
From WordNet (r) 3.0 (2006) [wn]:
fluorine
n
  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 fluorapatite
    Synonym(s): fluorine, F, atomic number 9
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Fluorine \Flu"or*ine\ (? [or] ?; 104), n. [NL. fluorina: cf. G.
      fluorin, F. fluorine. So called from its occurrence in the
      mineral fluorite.] (Chem.)
      A non-metallic, gaseous element, strongly acid or negative,
      or 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. If
      set free it immediately attacks the containing material, so
      that it was not isolated until 1886. It is a pungent,
      corrosive, colorless gas. Symbol F. Atomic weight 19.
  
      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.

From The Elements (22Oct97) [elements]:
   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 severe chemical
   burns on contact with flesh. Fluorine was identified by Scheele in 1771
   and first isolated by Moissan in 1886.
  
  
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