Potassium vs Iron
| Property | K Potassium | Fe Iron |
|---|---|---|
| Atomic number | 19 | 26 |
| Symbol | K | Fe |
| Name | Potassium | Iron |
| Category | alkali-metal | transition-metal |
| Standard Atomic Weight | 39.0983 u | 55.845 u |
| Period | 4 | 4 |
| Group | 1 | 8 |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s1 | [Ar]4s23d6 |
| Oxidation states | [-1, 1] | [-4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7] |
| Electronegativity (Pauling) | 0.82 | 1.83 |
| Electron affinity | 0.5014 eV | 0.151 eV |
| Density | 890 kg/m³ | 7874 kg/m³ |
| Melting point | 63.38 °C | 1537.85 °C |
| Boiling point | 758.85 °C | 2860.85 °C |
| Discovery year | 1807 | N/A |