praseodimyum

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praseodymium
A metallic chemical element (symbol Pr) with an atomic number of 59
An elementary substance, one of the constituents of didymium; so called from the green color of its salts
Atomic weight 143
{i} rare metallic chemical element
a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process
Symbol Ps