| Property | Value |
|---|---|
| Atoomnummer | 69 |
| Atoomgewicht | 168.934212 amu |
| Element family | N/A |
| Elektronische configuratie | 1s2 |
| Stable and very long lived isotopes | 169Tm: 100% |
| Previous element | Erbium |
| Next element | Ytterbium |
| Dichtheid | 9.321 g/cm3 (STP) |
| Smelten | 1545 °C |
| Kookpunt | 1727 °C |
| Covalente straal | 1.64 Å |
| Ionstraal | 0.869 Å |
| Metalic radius | 1.759 Å |
| Eerst ionisatiepotentiaal | 6.184 eV |
| Elektronenaffiniteit | 1.029 eV |
| Electronegativity | 1.25 |
| Discovery year | 1879 |
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