19 K
Alkali metal
Potassium
Vital for nerves and plants.
Properties of Potassium
- Atomic number (Z)
- 19
- Symbol
- K
- Atomic mass
- 39.098 g/mol
- Category
- Alkali metal
- Group
- 1
- Period
- 4
- Electron configuration
- [Ar] 4s¹
- Electronegativity (Pauling)
- 0.82
- Atomic radius
- 243 pm
- First ionization energy
- 419 kJ/mol
- Melting point
- 336.53 K (63.4 °C)
- Boiling point
- 1032 K (758.9 °C)
- Density
- 0.862 g/cm³
- Phase at 25 °C
- Solid
- Discovered
- Discovered in 1807