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Praseodymium (Pr)
Atomic number 59 · Lanthanide
| Atomic number | 59 |
|---|---|
| Atomic mass | 140.90766 u |
| Molar mass | 140.90766 g/mol |
| Category | Lanthanide |
| Group / period / block | — / 6 / f |
| Electron configuration | [Xe] 4f3 6s2 |
| Electrons per shell | 2, 8, 18, 21, 8, 2 |
| Electronegativity (Pauling) | 1.13 |
| Atomic radius | 185.0 pm |
| Density | 6.773 g/cm³ |
| First ionisation energy | 5.4702 eV |
| Melting point | 1204.15 K (931.00 °C) |
| Boiling point | 3793.15 K (3520.00 °C) |
| Common oxidation states | +3 |
| Abundance in Earth's crust | 9.2 ppm |
Uses
Strong magnets, welders' goggles
Discovery
1885, C.F. Aver von Welsbach