Sodium

Atomic symbol: Na
Atomic number: 11
Atomic mass: 22.99

Appearance: Soft, silvery white solid at 25°C

Group: 1
Period: 3
Series: Alkali metals
Block: s
Electron configuration: 1s² 2s² 2p⁶ 3s¹

Highly reactive metal, readily oxidising in air.

Sodium burns with a yellow flame.

Fun Fact! Not all metals are rock hard. At room temperature, sodium is soft enough to cut with a butter knife!