| Property | Value |
|---|---|
| Atomic number | 69 |
| Atomic weight | 168.934212 amu |
| Element family | N/A |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | 169Tm: 100% |
| Previous element | Erbium |
| Next element | Ytterbium |
| Density | 9.321 g/cm3 (STP) |
| Melting | 1545 °C |
| Boiling | 1727 °C |
| Covalent radius | 1.64 Å |
| Ionic radius | 0.869 Å |
| Metallic radius | 1.759 Å |
| First ionization potential | 6.184 eV |
| Electron affinity | 1.029 eV |
| Electronegativity | 1.25 |
| Discovery year | 1879 |
Thulium is an element number 69 from n/a family. Its symbol is Tm. Thulium atomic weight is 168.934212 amu. Tm stable and long lived isotopes are 169Tm: 100%. Thulium electronic configuration is 1s22s22p63s23p63d104s24p64d105s25p66s24f13. Thulium density is 9.321 g/cm3 (STP). Thulium melting point is 1545 °C. Thulium boiling point is 1727 °C. Thulium covalent radius is 1.64 Å. Thulium ionic radius is 0.869 Å. Thulium covalent radius is 1.759 Å. Thulium first ionization potential is 6.184 eV. Thulium first ionization potential is 1.029 eV. Thulium electronegativity by Pauling scale is 1.25. Thulium was discovered in 1879.
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