| Attribute | Value |
|---|---|
| Symbol | Tm |
| Standard state | Solid |
| Atomic mass | 168.93422 u |
| Electron configuration | [Xe]6s²4f¹³ |
| Oxidation states |
|
| Electronegativity (pauling scale) | 1.25 |
| Atomic radius (van der waals) | 227 pm |
| Ionization energy | 6.184 eV |
| Melting point | 1818 K |
| Boiling point | 2223 K |
| Density | 9.32 g/cm³ |
| Atomic number | 69 |
| Group name | Lanthanide |
| Discovered | 1879 year |
| Electron affinity | Add |