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lutetiummore about lutetium

lutetium


  2  definitions  found 
 
  From  WordNet  r  1.6  [wn]: 
 
  lutetium 
  n  :  a  trivalent  metallic  element  of  the  rare  earth  group 
  usually  occurs  in  association  with  yttrium  [syn:  {lutecium}, 
  {Lu},  {atomic  number  71}] 
 
  From  Elements  database  20001107  [elements]: 
 
  lutetium 
  Symbol:  Lu 
  Atomic  number:  71 
  Atomic  weight:  194.967 
  Silvery-white  rare-earth  metal  which  is  relatively  stable  in  air.  It 
  happens  to  be  the  most  expensive  rare-earth  metal.  Its  found  with  almost 
  all  rare-earth  metals,  but  is  very  difficult  to  separate  from  other 
  elements.  Least  abundant  of  all  natural  elements.  Used  in  metal  alloys, 
  and  as  a  catalyst  in  various  processes.  There  are  two  natural,  stable 
  isotopes,  and  seven  radioisotopes,  the  most  stable  being  Lu-174  with  a 
  half-life  of  3.3  years.  The  separation  of  lutetium  from  {ytterbium}  was 
  described  by  Georges  Urbain  in  1907.  It  was  discovered  at  approximately 
  the  same  time  by  Carl  Auer  von  Welsbach.  The  name  comes  from  the  Greek 
  word  lutetia  which  means  Paris. 
 
 




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