Praseodymium vs Thulium
| Property | Pr Praseodymium | Tm Thulium |
|---|---|---|
| Atomic number | 59 | 69 |
| Symbol | Pr | Tm |
| Name | Praseodymium | Thulium |
| Category | lanthanide | lanthanide |
| Standard Atomic Weight | 140.90766 u | 168.93422 u |
| Period | 6 | 6 |
| Group | N/A | N/A |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Xe]6s24f3 | [Xe]6s24f13 |
| Oxidation states | [0, 1, 2, 3, 4, 5] | [0, 1, 2, 3] |
| Electronegativity (Pauling) | 1.13 | 1.25 |
| Electron affinity | 0.962 eV | 1.029 eV |
| Density | 6770 kg/m³ | 9320 kg/m³ |
| Melting point | 930.85 °C | 1544.85 °C |
| Boiling point | 3519.85 °C | 1949.85 °C |
| Discovery year | 1885 | 1879 |