Get Affordable VMs - excellent virtual server hosting


browse words by letter
a b c d e f g h i j k l m n o p q r s t u v w x y z

neodymiummore about neodymium

neodymium

 

  4  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Neodymium  \Ne`o*dym"i*um\,  n.  [NL.  Dee  {Neo-},  and  {Didymium}.] 
  (Chem.) 
  An  elementary  substance  which  forms  one  of  the  constituents 
  of  didymium.  Symbol  Nd  Atomic  weight  140.8. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Neodymium  \Ne`o*dym"i*um\,  n.  [NL.  See  {Neo-},  {Didymium}.] 
  (Chem.) 
  A  rare  metallic  element  occurring  in  combination  with  cerium, 
  lanthanum,  and  other  rare  metals,  and  forming 
  amethyst-colored  salts.  It  was  separated  in  1885  by  von 
  Welsbach  from  praseodymium,  the  two  having  previously  been 
  regarded  as  a  single  element  (didymium).  It  is  chiefly 
  trivalent.  Symbol  Nd  at  wt  144.3. 
 
  From  WordNet  r  1.6  [wn]: 
 
  neodymium 
  n  :  a  yellow  trivalent  metallic  element  of  the  rare  earth  group 
  occurs  in  monazite  and  bastnasite  in  association  with 
  cerium  and  lanthanum  and  praseodymium  [syn:  {Nd},  {atomic 
  number  60}] 
 
  From  Elements  database  20001107  [elements]: 
 
  neodymium 
  Symbol:  Nd 
  Atomic  number:  60 
  Atomic  weight:  144.24 
  Soft  bright  silvery  metallic  element,  belongs  to  the  lanthanoids.  Seven  natural 
  isotopes,  Nd-144  being  the  only  radioactive  one  with  a  half-life  of  10^10 
  to  10^15  years.  Six  artificial  radioisotopes  have  been  produced.  The 
  metal  is  used  in  glass  works  to  color  class  a  shade  of  violet-purple  and 
  make  it  dichroic.  One  of  the  more  reactive  rare-earth  metals,  quickly  reacts 
  with  air.  Used  in  some  rare-earth  alloys.  Neodymium  is  used  to  color 
  the  glass  used  in  welder's  glasses.  Neodymium  is  also  used  in  very 
  powerful,  permanent  magnets  (Nd2Fe14B).  Discovered  by  Carl  F.  Auer  von 
  Welsbach  in  Austria  in  1885  by  separating  didymium  into  its  elemental 
  components  {praseodymium}  and  neodymium.  The  name  comes  from  the  Greek  words 
  "neos  didymos"  which  means  "new  twin".  Neodymium  should  be  considered 
  highly  toxic,  however  evidence  would  seem  to  show  that  it  acts  as  little 
  more  than  a  skin  and  eye  irritant.  The  dust  however,  presents  a  fire  and 
  explosion  hazard.




more about neodymium