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59Pr140.908
Praseodymium
LanthanidePraseodymium is a chemical element with symbol Pr and atomic number 59. Praseodymium is a soft, silvery, malleable and ductile metal in the lanthanide group. It is valued for its magnetic, electrical, chemical, and optical properties.
Phase: SolidAppearance: grayish white
2, 8, 18, 21, 8, 2
Physical Properties
Atomic Mass140.907662 u
Density6.77 g/cm³
Melting Point1208 K
Boiling Point3403 K
Molar Heat27.2 J/(mol·K)
Period6
PhaseSolid
Chemical Properties
Electron Configuration1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f3
Semantic Config[Xe] 4f3 6s2
Shells2, 8, 18, 21, 8, 2
Electron Affinity93 kJ/mol
Electronegativity1.13
Ionization Energies
IE1: 527 kJ/molIE2: 1020 kJ/molIE3: 2086 kJ/molIE4: 3761 kJ/molIE5: 5551 kJ/mol
Discovery
Discovered byCarl Auer von Welsbach