Iridium vs Polonium
| Property | Ir Iridium | Po Polonium |
|---|---|---|
| Atomic number | 77 | 84 |
| Symbol | Ir | Po |
| Name | Iridium | Polonium |
| Category | transition-metal | metalloid |
| Standard Atomic Weight | 192.217 u | 209 u |
| Period | 6 | 6 |
| Group | 9 | 16 |
| Block | s | p |
| Phase at STP | solid | solid |
| Electron configuration | [Xe]6s24f145d7 | [Xe]6s24f145d106p4 |
| Oxidation states | [-3, -2, -1, 1, 2, 3, 4, 5, 6, 7, 8, 9] | [-2, 2, 4, 5, 6] |
| Electronegativity (Pauling) | 2.2 | 2 |
| Electron affinity | 1.565 eV | 1.9 eV |
| Density | 2.256220e+4 kg/m³ | 9320 kg/m³ |
| Melting point | 2445.85 °C | 253.85 °C |
| Boiling point | 4427.85 °C | 961.85 °C |
| Discovery year | 1803 | 1898 |