Tm
Thulium
Element 69 · Lanthanide · Period 6, Group 15
Solid · Discovered 1879
Atomic Properties
| Atomic Number | 69 |
| Atomic Mass | 168.93422u |
| Electron Configuration | [Xe]6s2 4f13 |
| Electronegativity | 1.25Pauling |
| Atomic Radius | 227pm |
| Ionization Energy | 6.184eV |
| Oxidation States | +3 |
Physical Properties
| Standard State | Solid |
| Melting Point | 1818K |
| Boiling Point | 2223K |
| Density | 9.32g/cm³ |
| Group Block | Lanthanide |
| Year Discovered | 1879 |