Praseodymium |
| Symbol | Pr |
|---|---|
| Latin name | Praseodymium |
| Atomic number | 59 |
| Period | 6 |
| Element category | Inner transition elements |
| Relative atomic mass | 140.90765 |
| Group | III.B |
| Electronegativity | 1.2 |
| Oxidation numbers | 3, 4 |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f3 5d0 6s2 |
| Density [g/cm3] | 6.773 |
| State | Solid |
| Melting point [°C] | 931 |
| Boiling point [°C] | 3212 |
| Atomic radius [pm] | 247 |
| Covalent radius [pm] | 164 |
| Thermal conductivity [W m-1K-1] | 12.5 |
| Heat capacity [J K-1g-1] | 0.193 |
| Discovery | 1885 |
| Vickers hardness [MPa] | 400 |
| Brinell hardness [MPa] | 481 |
| Young's modulus [GPa] | 37 |
| Electrical conductivity [S m-1] | 1.4 · 106 |
| Shear modulus [GPa] | 15 |
| 1.st ionization energy [eV] | 5.464 |
| 2.nd ionization energy [eV] | 10.551 |
| 3.rd ionization energy [eV] | 21.62 |
| Stable isotopes | 1 |
| Unstable isotopes | 14 |