| Attribute | Thulium × | Dysprosium × |
|---|---|---|
| Standard state | Solid | Solid |
| Electron configuration | [Xe]6s²4f¹³ | [Xe]6s²4f¹⁰ |
| Atomic mass (u) | 168.93422 | 162.5 |
| Electronegativity (pauling scale) | 1.25 | 1.22 |
| Oxidation states |
|
|
| Ionization energy (eV) | 6.184 | 5.939 |
| Atomic radius (van der waals) (pm) | 227 | 229 |
| Boiling point (K) | 2223 | 2840 |
| Melting point (K) | 1818 | 1685 |
| Density (g/cm³) | 9.32 | 8.55 |
| Atomic number | 69 | 66 |
| Group name | Lanthanide | Lanthanide |
| Discovered (year) | 1879 | 1886 |
| Symbol | Tm | Dy |