Silicon (Si)

Silicon is a chemical element with symbol Si and atomic number 14. It is a hard and brittle crystalline solid with a blue-grey metallic lustre, and is a tetravalent metalloid and semiconductor.

Atomic Number

14

Atomic Mass

28.085 u

Category

metalloid

Phase

solid

Density

2.33 g/cm³

Electron Shells

2, 8, 4

Atomic Structure

Protons: 14 • Electrons: 14 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p²

Discovery

1824 • Jöns Jacob Berzelius