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praseodymium    
n. 镨

镨

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}]

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]


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  • Slide 1
    Derive the correct formula for AO Discuss the nature of nonstoichiometry in (a) copper sulfide, (b) zinc oxide, (c) praseodymium oxide What are the different structures in the case of (c) NiTe exhibits nonstoichiometry Draw schematic diagrams to illustrate the crystal structures of the two extreme formulations
  • Periodic Table of the Elements - teachnlearnchem. com
    Interactive periodic table Physicist Timmothy Stowe's periodic table places elements in discrete levels It is plotted in three dimensions, with the three axes representing the principal quantam number, nthe orbital quantam number, land the orbital magnetic quantam number, ml Physicist Timmothy Stowe's periodic table places elements in discrete levels It is plotted in three dimensions, with
  • Geochemistry - an Introduction
    Second, the lighter rare earth elements (lowest Atomic Number, are cerium, lanthanum, praseodymium, neodymium, samarium and scandium) are more incompatible (because they have larger ionic radii) and therefore more strongly concentrated in the continental crust than the heavier rare earth elements
  • Biological Effects of Radiation
    Note that this slide expresses natural background ionizing radiation exposures in absorbed dose per hour (nGy h), rather than the more commonly found expression of equivalent dose per year (mrem y) Absorbed dose per hour is a more appropriate unit for expressing chronic ionizing radiation exposure as explained previously That is, since the body’s adaptive protection mechanisms repair





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