Thallium
Post-transition metal| Atomic number | 81 |
|---|---|
| Category | Post-transition metal |
| Atomic mass | 204.38 |
| Electron configuration | [Xe]4f¹⁴ 5d¹⁰ 6s² 6p¹ |
| Oxidation states | +1, +3 |
| Electronegativity | 1.62 |
| Melting point | 304 °C |
| Boiling point | 1,473 °C |
| Density | 11.85 g/cm³ |
| Crystal structure | Close-packed hexagonal |
| Group | 13 |
| Period | 6 |
| Block | p |
| Discovered | 1,861 |
| Crustal abundance | 0.85 ppm |