Cerium Neodymium

Praseodymium (Pr)

From Wikipedia, the free encyclopediaPraseodymium 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.
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Praseodymium in the periodic table

SymbolPr
Atomic number59
Group0
Period6
Blockf
Element categoryLanthanide

Physical properties

Phase at STPSolid
Density6.77 g/cm3
Atomic weight140.908 u
Melting point1208 K
934.85 °C
1714.73 °F
Boiling point3403 K
3129.85 °C
5665.73 °F

Atomära egenskaper

Electronegativity (Pauling Scale)1.13
Electron affinity93 kJ/mol
Ionization energies
1527 kJ/mol
2 1020 kJ/mol
3 2086 kJ/mol
4 3761 kJ/mol
5 5551 kJ/mol

Electron configuration

Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f3 5s2 5p6 6s2
Electrons per shell2, 8, 18, 21, 8, 2

History

Discovered1885
Discovered byCarl Auer von Welsbach