Praseodymium is a chemical element that has the symbol Pr and atomic number 59. Praseodymium is a soft, silvery, malleable and ductile metal in the lanthanide group. It is too reactive to be found in native form, and when artificially prepared, it slowly develops a green oxide coating.Symbol: Pr
Electron configuration: Xe 4f3 6s2
Melting point: 930.8 °C
Atomic number: 59
Discovered: 1885
Atomic mass: 140.90765 ± 0.00002 u