Thallium vs Polonium
| Property | Tl Thallium | Po Polonium |
|---|---|---|
| Atomic number | 81 | 84 |
| Symbol | Tl | Po |
| Name | Thallium | Polonium |
| Category | post-transition-metal | metalloid |
| Standard Atomic Weight | 204.3835 u | 209 u |
| Period | 6 | 6 |
| Group | 13 | 16 |
| Block | p | p |
| Phase at STP | solid | solid |
| Electron configuration | [Xe]6s24f145d106p1 | [Xe]6s24f145d106p4 |
| Oxidation states | [-5, -2, -1, 1, 2, 3] | [-2, 2, 4, 5, 6] |
| Electronegativity (Pauling) | 1.62 | 2 |
| Electron affinity | 0.377 eV | 1.9 eV |
| Density | 1.180000e+4 kg/m³ | 9320 kg/m³ |
| Melting point | 303.85 °C | 253.85 °C |
| Boiling point | 1472.85 °C | 961.85 °C |
| Discovery year | 1861 | 1898 |