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holmium

more about holmium

holmium


  3  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Holmium  \Hol"mi*um\,  n.  [NL.,  of  uncertain  origin.]  (Chem.) 
  A  rare  element  said  to  be  contained  in  gadolinite.  -- 
  {Hol"mic},  a. 
 
  From  WordNet  r  1.6  [wn]: 
 
  holmium 
  n  :  a  trivalent  metallic  element  of  the  rare  earth  group  occurs 
  together  with  yttrium;  forms  highly  magnetic  compounds 
  [syn:  {Ho},  {atomic  number  67}] 
 
  From  Elements  database  20001107  [elements]: 
 
  holmium 
  Symbol:  Ho 
  Atomic  number:  67 
  Atomic  weight:  167.26 
  Relatively  soft  and  malleable  silvery-white  metallic  element,  which  is  stable 
  in  dry  air  at  room  temperature.  It  oxidizes  in  moist  air  and  at  high 
  temperatures.  It  belongs  to  the  lanthanoids.  A  rare-earth  metal,  it  is  found 
  in  the  minerals  monazite  and  gadolinite.  It  possesses  unusual  magnetic 
  properties.  One  natural  isotope,  Ho-165  exists,  six  radioisotopes  exist,  the 
  most  stable  being  Ho-163  with  a  half-life  of  4570  years.  Holmium  is  used  in 
  some  metal  alloys,  it  is  also  said  to  stimulate  the  metabolism.  Discovered  by 
  Per  Theodor  Cleve  and  J.L.  Soret  in  Switzerland  in  1879.  The  name  homium  comes 
  from  the  Greek  word  Holmia  which  means  Sweden.  While  all  holmium  compounds 
  should  be  considered  highly  toxic,  initial  evidence  seems  to  indicate  that 
  they  do  not  pose  much  danger.  The  metal's  dust  however,  is  a  fire  hazard. 
 
 




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