Sodium (Na)

Sodium is a chemical element with symbol Na and atomic number 11. It is a soft, silvery-white, highly reactive metal.

Atomic Number

11

Atomic Mass

22.99 u

Category

alkali metal

Phase

solid

Density

0.968 g/cm³

Electron Shells

2, 8, 1

Atomic Structure

Protons: 11 • Electrons: 11 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p⁶ 3s¹

Discovery

1807 • Humphry Davy