K
Potassium
Element 19 · Alkali metal · Period 4, Group 1
Solid · Discovered 1807
Atomic Properties
| Atomic Number | 19 |
| Atomic Mass | 39.0983u |
| Electron Configuration | [Ar]4s1 |
| Electronegativity | 0.82Pauling |
| Atomic Radius | 275pm |
| Ionization Energy | 4.341eV |
| Electron Affinity | 0.501eV |
| Oxidation States | +1 |
Physical Properties
| Standard State | Solid |
| Melting Point | 336.53K |
| Boiling Point | 1032K |
| Density | 0.89g/cm³ |
| Group Block | Alkali metal |
| Year Discovered | 1807 |