| Attribute | Value |
|---|---|
| Symbol | K |
| Standard state | Solid |
| Atomic mass | 39.0983 u |
| Electron configuration | [Ar]4s¹ |
| Oxidation states |
|
| Electronegativity (pauling scale) | 0.82 |
| Atomic radius (van der waals) | 275 pm |
| Ionization energy | 4.341 eV |
| Electron affinity | 0.501 eV |
| Melting point | 336.53 K |
| Boiling point | 1032 K |
| Density | 0.89 g/cm³ |
| Atomic number | 19 |
| Group name | Alkali metal |
| Discovered | 1807 year |