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. | |||||||||||
Praseodymium in the periodic table | |||||||||||
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Symbol | Pr | ||||||||||
Atomic number | 59 | ||||||||||
Group | 0 | ||||||||||
Period | 6 | ||||||||||
Block | f | ||||||||||
Element category | Lanthanide | ||||||||||
Physical properties | |||||||||||
Phase at STP | Solid | ||||||||||
Density | 6.77 g/cm3 | ||||||||||
Atomic weight | 140.908 u | ||||||||||
Melting point | 1208 K 934.85 °C 1714.73 °F | ||||||||||
Boiling point | 3403 K 3129.85 °C 5665.73 °F | ||||||||||
Atomic properties | |||||||||||
Electronegativity (Pauling Scale) | 1.13 | ||||||||||
Electron affinity | 93 kJ/mol | ||||||||||
Oxidation states | 0, +1, +2, +3, +4, +5 (a mildly basic oxide) | ||||||||||
Ionization energies |
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Electron configuration | |||||||||||
Elektronkonfiguration (shorthand) | [Xe] 4f3 6s2 | ||||||||||
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f3 5s2 5p6 6s2 | ||||||||||
Electrons per shell | 2, 8, 18, 21, 8, 2 | ||||||||||
History | |||||||||||
Discovered | 1885 | ||||||||||
Discovered by | Carl Auer von Welsbach |