Thulium vs Ytterbium
Pick up to 3 elements and see how they stack up.
| Property | Thulium | Ytterbium |
|---|---|---|
| Atomic number | 69 | 70 |
| Atomic mass | 168.93 | 173.05 |
| Electronegativity | 1.25 | 1.1 |
| Melting point | 1,818 K (1,544.8 °C) | 1,097 K (823.8 °C) |
| Boiling point | 2,223 K (1,949.8 °C) | 1,469 K (1,195.8 °C) |
| Density | 9.32 g/cm³ | 6.9 g/cm³ |
| Atomic radius | 227 pm | 242 pm |
| Ionization energy | 6.184 eV | 6.254 eV |
| Discovered | 1879 | 1878 |
| Category | Lanthanide | Lanthanide |
| State at room temp. | Solid | Solid |
| Block | f | f |
| Group | — | — |
| Period | 6 | 6 |
| Valence electrons | 2 | 2 |
| Common charges | +3 | +2, +3 |
| Electron configuration | [Xe] 4f13 6s2 | [Xe] 4f14 6s2 |