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dysprosium

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dysprosium


  3  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Dysprosium  \Dys*pro"si*um\,  n.  [NL.,  fr  Gr  dyspro`sitos  hard 
  to  get  at.]  (Chem.) 
  An  element  of  the  rare  earth-group.  Symbol  Dy  at  wt., 
  162.5. 
 
  From  WordNet  r  1.6  [wn]: 
 
  dysprosium 
  n  :  a  trivalent  metallic  element  of  the  rare  earth  group  forms 
  compounds  that  are  highly  magnetic  [syn:  {Dy},  {atomic 
  number  66}] 
 
  From  Elements  database  20001107  [elements]: 
 
  dysprosium 
  Symbol:  Dy 
  Atomic  number:  66 
  Atomic  weight:  162.50 
  Metallic  with  a  bright  silvery-white  lustre.  Dysprosium  belongs  to  the 
  lanthanoids.  It  is  relatively  stable  in  air  at  room  temperatures,  it  will 
  however  dissolve  in  mineral  acids,  evolving  hydrogen.  It  is  found  in 
  from  rare-earth  minerals.  There  are  seven  natural  isotopes  of  dysprosium, 
  and  eight  radioisotopes,  Dy-154  being  the  most  stable  with  a  half-life  of 
  3*10^6  years.  Dysprosium  is  used  as  a  neutron  absorber  in  nuclear  fission 
  reactions,  and  in  compact  disks.  It  was  discovered  by  Paul  Emile  Lecoq  de 
  Boisbaudran  in  1886  in  France.  Its  name  comes  from  the  Greek  word 
  dysprositos  which  means  hard  to  obtain. 
 
 




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