| Potassium ✕ | |
|---|---|
| Symbol | K |
| Atomic number | 19 |
| Chemical property | Alkali metal |
| Origin o the name | New Latin potassa, 'potash' (kalium in Latin) |
| Group | 1 |
| Period | 4 |
| Atomic weight (u) | 39.0983 |
| Atomic weight uncertainty (u) | 0.0001 |
| Density (g/cm³) | 0.862 |
| Melting point (K) | 336.53 |
| Boiling point (K) | 1032 |
| Heat capacity (J/(g·K)) | 0.757 |
| Electro-negativity | 0.82 |
| Abundance in earth's crust (mg/kg) | 20900 |