Pr
Praseodymium gives glass and enamel a distinctive yellow-green color.
Physical Properties
| Atomic Mass | 140.91 u |
| Density | 6.773 g/cm³ |
| Melting Point | 1208.0 K |
| Boiling Point | 3793.0 K |
| Appearance | Grayish-white metallic |
| State at Room Temp | Solid |
Chemical Properties
| Electronegativity | 1.13 (Pauling) |
| 1st Ionization Energy | 527.0 kJ/mol |
| Electron Affinity | 93.0 kJ/mol |
| Oxidation States | +2, +3, +4 |
Atomic Properties
| Electron Configuration | [Xe] 4f3 6s2 |
| Atomic Radius | 182.0 pm |
| Covalent Radius | 203.0 pm |
| Van der Waals Radius | 239.0 pm |
Discovery
| Discovered By | Carl Auer von Welsbach |
| Discovery Year | 1885 |
| Location | Vienna, Austria |
| Named After | Greek 'prasios didymos' meaning green twin |
About Praseodymium
Praseodymium is a soft, silvery, malleable metal separated from neodymium in 1885 by Welsbach from what was thought to be 'didymium.'
Uses & Applications
Magnets (with neodymium), aircraft engines, welder's goggles, and ceramics colorant.
Fun Fact
Praseodymium was hidden for decades inside 'didymium' until it was finally separated from neodymium in 1885.
Isotopes
| Mass Number | Abundance | Half-Life | Stable |
| 141 | 1.0% | - | Yes |
Electron Configuration
[Xe] 4f3 6s2