Thulium
| Latin name | Thulium |
| English name | Thulium |
| chemical symbol | Tm |
| atomic number | 69 |
| relative atomic mass | 168,93421 |
| period | 6 |
| group | III.B |
| classification | lanthanides |
| discovery year | 1879 |
| discoverer | Per Cleve |
| melting point [°C] | 1545 |
| boiling point [°C] | 1950 |
| density [g cm-3] | 9,33 |
| density at melting point [g cm-3] | 8,56 |
| electronegativity [Pauling] | 1,25 |
| oxidation states | II, III |
| electron configuration | [Xe]4f13 6s2 |
| atomic radius [pm] | 222 |
| specific heat [J g-1K-1] | 0,16 |
| heat of fusion [kJ mol-1] | 16,84 |
| thermal conductivity [W m-1 K-1] | 17 |
| el. conductivity [S m-1] | 1,4.106 |
| 1. ionizing potential [eV] | 6,1843 |
| 2. ionizing potential [eV] | 12,054 |
| 3. ionizing potential [eV] | 26,367 |
| Vickers hardness [MPa] | 520 |
| Brinell hardness [MPa] | 471 |
| shear modulus [GPa] | 31 |
| Young's modulus [GPa] | 74 |
| Curie point [K] | 25 |
| state at normal conditions | solid |
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