59 Pr

Praseodymium

Lanthanide
Atomic number59
CategoryLanthanide
Atomic mass140.91
Electron configuration[Xe]4f³ 6s²
Oxidation states+3
Electronegativity1.13
Melting point935 °C
Boiling point3,520 °C
Density6.77 g/cm³
Crystal structureHexagonal
Period6
Blockf
Discovered1,885
Crustal abundance9.2 ppm

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