Periodic Table of Elements




Swedish chemist Johan August Arfwedson discovered lithium in Stockholm, Sweden, in 1817.

Name: Lithium
Symbol: Li
Atomic number: 3
Atomic weight: 6.94
State: solid
Group, period, block: 1, 2, s
Color: silvery white
Classification: alkali metal
Electron configuration: 1s2 2s1

Physical properties

Density: 0.534 g/cm-3
Melting point: 453.69 K,180.54 C,356.97 F
Boiling point: 1615 K,1342 C,2448 F

Atomic properties

Oxidation states: +1, -1
Electronegativity: 0.98 (Pauling scale)
Ionization energies: 1st: 520.2 kJmol-1
Covalent radius: 1287 pm
Van der Waals radius: 182 pm
  • Li
  • Electron Configuration


There are two stable isotopes of lithium, 6H, 2Li and 7Li.

About 92.5% of the lithium in nature is 7Li.