Iron vs Thulium
| Property | Fe Iron | Tm Thulium |
|---|---|---|
| Atomic number | 26 | 69 |
| Symbol | Fe | Tm |
| Name | Iron | Thulium |
| Category | transition-metal | lanthanide |
| Standard Atomic Weight | 55.845 u | 168.93422 u |
| Period | 4 | 6 |
| Group | 8 | N/A |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s23d6 | [Xe]6s24f13 |
| Oxidation states | [-4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7] | [0, 1, 2, 3] |
| Electronegativity (Pauling) | 1.83 | 1.25 |
| Electron affinity | 0.151 eV | 1.029 eV |
| Density | 7874 kg/m³ | 9320 kg/m³ |
| Melting point | 1537.85 °C | 1544.85 °C |
| Boiling point | 2860.85 °C | 1949.85 °C |
| Discovery year | N/A | 1879 |