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thuliummore about thulium

thulium


  3  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Thulium  \Thu"li*um\,  n.  [NL.  See  {Thule}.]  (Chem.) 
  A  rare  metallic  element  of  uncertain  properties  and  identity, 
  said  to  have  been  found  in  the  mineral  gadolinite. 
 
  From  WordNet  r  1.6  [wn]: 
 
  thulium 
  n  :  a  soft  silvery  metallic  element  of  the  rare  earth  group 
  isotope  170  emits  X-rays  and  is  used  in  small  portable 
  X-ray  machines;  it  occurs  in  monazite  and  apatite  and 
  xenotime  [syn:  {Tm},  {atomic  number  69}] 
 
  From  Elements  database  20001107  [elements]: 
 
  thulium 
  Symbol:  Tm 
  Atomic  number:  69 
  Atomic  weight:  168.934 
  Soft  grey  metallic  element  that  belongs  to  the  lanthanoids.  One  natural 
  isotope  exists,  Tm-169,  and  seventeen  artificial  isotopes  have  been 
  produced.  No  known  uses  for  the  element.  Discovered  in  1879  by  Per  Theodor 
  Cleve. 
 
 




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