PR-138 has various meanings in the Scientific & Educational category. Discover the full forms, definitions, and usage contexts of PR-138 in Scientific & Educational.
Symbol:"Pr" Atomic Number:"59" Atomic Mass: 140.91amu. Praseodymium is one of the elements in the lanthanide series of inner transition elements. It may also be classified as a rare earth element. This soft, silvery metal can be found in many minerals and even some cigarette lighter sparking mechanisms.
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