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praseodymium |
3 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: 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. From WordNet r 1.6 [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.
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