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Praseodymium (symbol Pr) is a chemical element, atomic number 59 on the periodic table.
Praseodymium has an atomic mass of 140.907. Praseodymium was discovered by Humans on Earth's European continent for the first time by scientists working in Austria in the year 1885. This element is part of the lanthanide series of heavy elements. (ST reference: Star Fleet Medical Reference Manual)