Symbol | Pr | Atomic radius: pm | 182 | Fusion: kJ/Mole | 6.89 |
Name | Praseodymium | Ionic radius: pm | (+3)113 | Boiling point: °C | 3520 |
Atomic number | 59 | Electron affinity | - | Melting point: °C | 931 |
Atomic weight | 140.9 | 1st ion potential | 5.46 | Specific Heat Cap: J/(g K) | 0.19 |
Classification | Trans metal | Natural form | Solid | Thermal Cond: W/(cm K) | 0.13 |
Configuration | [Xe]4f36s2 | Crystal structure | Hex | Electrical Cond | 0.0148 |
Oxidation states | 3,4 | Density | 6.77 | Abundance: mg/kg-crust | 9.2 |
Electronegativity | 1.13 | Vaporization: kJ/Mole | 333.0 | ||
Praseodymium was discovered in didymia, a mixture of several rare-earth oxides. From it, Carl Auer von Welsbach separated salts of the elements praseodymium and neodymium in 1885. | Uses - alloys, welder's masks, coloring galss and ceramics, core material for carbon arc lights used by motion picture industry |