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hafnium

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hafnium


  2  definitions  found 
 
  From  WordNet  r  1.6  [wn]: 
 
  hafnium 
  n  :  a  gray  tetravalent  metallic  element  that  resembles  zirconium 
  chemically  and  is  found  in  zirconium  minerals;  used  in 
  filaments  for  its  ready  emission  of  electrons  [syn:  {Hf}, 
  {atomic  number  72}] 
 
  From  Elements  database  20001107  [elements]: 
 
  hafnium 
  Symbol:  Hf 
  Atomic  number:  72 
  Atomic  weight:  178.49 
  Silvery  lustrous  metallic  transition  element.  Used  in  tungsten  alloys  in 
  filaments  and  electrodes,  also  acts  as  a  neutron  absorber.  First  reported 
  by  Urbain  in  1911,  existence  was  finally  established  in  1923  by  D.  Coster, 
  G.C.  de  Hevesy  in  1923. 
 
 




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