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fluorine

more about fluorine

fluorine


  3  definitions  found 
 
  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  WordNet  r  1.6  [wn]: 
 
  fluorine 
  n  :  a  nonmetallic  univalent  element;  usually  a  yellow  irritating 
  toxic  flammable  gas;  a  powerful  oxidizing  agent; 
  recovered  from  fluorite  or  cryolite  or  fluorapatite  [syn: 
  {F},  {atomic  number  9}] 
 
  From  Elements  database  20001107  [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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