| Element | Thulium | Symbol | Tm |
| Atomic Number | 69 | Molar Mass | 175 g mol-1 |
| Electron Configuration | [Xe]4f136s2 | Normal State | solid metal |
| Density @STP | 9.33 g cm-3 | Melting Point | 1545oC |
| Boiling Point | 1950oC | Stable Isotopes | 169Tm |
| Atomic Radius | 175 pm | Ionic Radius | 104 (3+) pm |
| Electronegativity (Pauling) | 1.25 | Ionization Energy (1st) | 597 kJ mol-1 |
| Ionization Energy (2nd) | 1163 kJ mol-1 | Ionization Energy (3rd) | 2285 kJ mol-1 |
| Molar Heat Capacity | 27 J K-1mol-1 | Standard Molar Entropy | 74 J K-1mol-1 |
| Enthalpy of Fusion | 18.4 kJ mol-1 | Enthalpy of Vapourization | 247 kJ mol-1 |