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Potassium (K)
Atomic number 19 · alkali
| Atomic number | 19 |
|---|---|
| Atomic mass | 39.0983 u |
| Molar mass | 39.0983 g/mol |
| Category | alkali |
| Group / period / block | 1 / 4 / s |
| Electron configuration | [Ar] 4s |
| Electrons per shell | 2, 8, 8, 1 |
| Electronegativity (Pauling) | 0.82 |
| Atomic radius | 220.0 pm |
| Density | 0.89 g/cm³ |
| First ionisation energy | 4.3407 eV |
| Melting point | 336.65 K (63.50 °C) |
| Boiling point | 1032.15 K (759.00 °C) |
| Common oxidation states | +1 |
| Abundance in Earth's crust | 20900 ppm |
Uses
Fertilisers, soap, nerve function
Discovery
1807, Sir Humphrey Davy