Praseodymium

3 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Praseodymium \Pra`se*o*dym"i*um\, n. [Praseo- + didymium.]
     (Chem.)
     An elementary substance, one of the constituents of didymium;
     -- so called from the green color of its salts. Symbol Ps.
     Atomic weight 143.6.
     [1913 Webster]



From WordNet (r) 2.0 [wn]:

  praseodymium
       n : a soft yellowish-white trivalent metallic element of the
           rare earth group; can be recovered from bastnasite or
           monazite by an ion-exchange process [syn: {Pr}, {atomic
           number 59}]

From Elements database 20001107 [elements]:

  praseodymium
  Symbol: Pr
  Atomic number: 59
  Atomic weight: 140.907
  Soft silvery metallic element, belongs to the lanthanoids. Only natural
  isotope is Pr-141 which is not radioactive.  Fourteen radioactive isotopes
  have been artificially produced. Used in rare-earth alloys. Discovered in
  1885 by C.A. von Welsbach.