Potassium vs Iridium
| Property | K Potassium | Ir Iridium |
|---|---|---|
| Atomic number | 19 | 77 |
| Symbol | K | Ir |
| Name | Potassium | Iridium |
| Category | alkali-metal | transition-metal |
| Standard Atomic Weight | 39.0983 u | 192.217 u |
| Period | 4 | 6 |
| Group | 1 | 9 |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s1 | [Xe]6s24f145d7 |
| Oxidation states | [-1, 1] | [-3, -2, -1, 1, 2, 3, 4, 5, 6, 7, 8, 9] |
| Electronegativity (Pauling) | 0.82 | 2.2 |
| Electron affinity | 0.5014 eV | 1.565 eV |
| Density | 890 kg/m³ | 2.256220e+4 kg/m³ |
| Melting point | 63.38 °C | 2445.85 °C |
| Boiling point | 758.85 °C | 4427.85 °C |
| Discovery year | 1807 | 1803 |