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praseodymium

n. 镨

镨

WordNet (r) 3.0 (2006) (WordNet)

praseodymium
n 1: a soft yellowish-white trivalent metallic element of the
rare earth group; can be recovered from bastnasite or
monazite by an ion-exchange process [synonym: {praseodymium},
{Pr}, {atomic number 59}]

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]

The Elements Database (element)

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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