Erbium vs Thulium
Pick up to 3 elements and see how they stack up.
| Property | Erbium | Thulium |
|---|---|---|
| Atomic number | 68 | 69 |
| Atomic mass | 167.26 | 168.93 |
| Electronegativity | 1.24 | 1.25 |
| Melting point | 1,802 K (1,528.8 °C) | 1,818 K (1,544.8 °C) |
| Boiling point | 3,141 K (2,867.8 °C) | 2,223 K (1,949.8 °C) |
| Density | 9.066 g/cm³ | 9.32 g/cm³ |
| Atomic radius | 235 pm | 227 pm |
| Ionization energy | 6.108 eV | 6.184 eV |
| Discovered | 1843 | 1879 |
| Category | Lanthanide | Lanthanide |
| State at room temp. | Solid | Solid |
| Block | f | f |
| Group | — | — |
| Period | 6 | 6 |
| Valence electrons | 2 | 2 |
| Common charges | +3 | +3 |
| Electron configuration | [Xe] 4f12 6s2 | [Xe] 4f13 6s2 |