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59
Pr
140.91
Praseodymium
Lanthanides · Group 5 · Period 6–7 (f)
Atomic properties
| Atomic number | 59 |
|---|---|
| Symbol | Pr |
| Standard atomic weight | 140.91 |
| Classification | Lanthanides |
| Group | f-block series |
| Period | 6 |
| Block | f-block (lanthanide) |
| Electron configuration | [Xe] 4f3 6s2 |
| Electronegativity (Pauling) | 1.13 |
| Common oxidation states | +3 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 6.77 g/cm³ |
| Melting point | 935 °C |
| Boiling point | 3520 °C |
| Discovered | 1885 |
| CAS number | — |