| Property | Value |
|---|---|
| Atomic number | 19 |
| Atomic weight | 39.09831 amu |
| Element family | Alkali metals |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | 39K: 93.2581%, 41K: 6.7302% |
| Previous element | Argon |
| Next element | Calcium |
| Density | 0.862 g/cm3 (STP) |
| Melting | 63.35 °C |
| Boiling | 774 °C |
| Covalent radius | 1.96 Å |
| Van der Waals radius | 2.75 Å |
| Ionic radius | 1.38 Å |
| Metallic radius | 2.27 Å |
| First ionization potential | 4.340 eV |
| Electron affinity | 0.501 eV |
| Electronegativity | 0.82 |
| Discovery year | 1807 |
Potassium is an element number 19 from alkali metals family. Its symbol is K. Potassium atomic weight is 39.09831 amu. K stable and long lived isotopes are 39K: 93.2581%, 41K: 6.7302%. Potassium electronic configuration is 1s22s22p63s23p64s1. Sample compounds that contain Potassium are KCl, KOH, KMnO4, KNO3, KClO3, KI.
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