Beryllium

Atomic symbol: Be
Atomic number: 4
Atomic mass: 9.01

Appearance: steel gray hard metal at 25°C

Group: 2
Period: 2
Series: Alkaline earth metals
Block: s
Electron configuration: 1s² 2s²

Used in aerospace design, nuclear weapons, and X-ray equipment.

Fun Fact! Beryllium was used by the Ancient Egyptians in jewellery.