Potassium

Atomic symbol: K
Atomic number: 19
Atomic mass: 39.10

Appearance: soft, silvery white solid at 25°C

Group: 1
Period: 4
Series: Alkali metals
Block: s
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4p¹

Potassium burns with a lilac flame.

Highly reactive, not found free in nature.

Fun Fact! In the human body, a potassium deficiency, known as hypokalemia, can be fata; potassium is essential to life.