| General |
|---|
| Name | Potassium | | Symbol | K | | Number | 19 | | Chemical series | Alkali metals | | Group / Period | 1 / 4 | | Block | s-block | | CAS registry number | 7440-09-7 |
| Physical properties |
|---|
| State | solid | | Density | 0.89 g/cm3 | | Melting point | 336.53 K (63.38°C, 146.08°F) | | Boiling point | 1032 K (759°C, 1398°F) | | Critical point | |
| Atomic properties |
|---|
| Atomic Weight | 39.0983 g/mol | | Crystal structure | cubic body centered | | Electronegativity | 0.82 | | Atomic radius | 220 pm | | Atomic radius (calculated) | 243 pm | | Electron configuration | [Ar] 4s1 | | Electrons per shell | 2, 8, 8, 1 | | Number of protons | 19 | | Number of neutrons | 20 |
|
Calcium