Tl
Thallium
Element 81 · Post-transition metal · Period 6, Group 13
Solid · Discovered 1861
Atomic Properties
| Atomic Number | 81 |
| Atomic Mass | 204.383u |
| Electron Configuration | [Xe]6s2 4f14 5d10 6p1 |
| Electronegativity | 1.62Pauling |
| Atomic Radius | 196pm |
| Ionization Energy | 6.108eV |
| Electron Affinity | 0.2eV |
| Oxidation States | +3, +1 |
Physical Properties
| Standard State | Solid |
| Melting Point | 577K |
| Boiling Point | 1746K |
| Density | 11.8g/cm³ |
| Group Block | Post-transition metal |
| Year Discovered | 1861 |