Lithium (Li)

Lithium is a soft, silvery-white alkali metal. Under standard conditions, it is the lightest metal and the lightest solid element.

Atomic Number

3

Atomic Mass

6.94 u

Category

alkali metal

Phase

solid

Density

0.534 g/cm³

Electron Shells

2, 1

Atomic Structure

Protons: 3 • Electrons: 3 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s¹

Discovery

1817 • Johan August Arfwedson