Periodic Table of Elements




First proposed to exist by Dmitri Mendeleyev in 1871. Gallium was discovered by the French chemist Paul mile Lecoq de Boisbaudran in France in 1875.

Name: Gallium
Symbol: Ga
Atomic number: 31
Atomic weight: 69.723
State: solid
Group, period, block: 13, 4, p
Color: silver-white
Classification: post-transition metal
Electron configuration: 4s2 3d10 4p1

Physical properties

Density: 5.91 g/cm-3
Melting point: 302.9146 K, 29.7646 C, 85.5763 F
Boiling point: 2477 K, 2204 C, 3999 F

Atomic properties

Oxidation states: 3, 2, 1
Electronegativity: 1.81 (Pauling scale)
Ionization energies: 1st: 578.8 kJmol-1
Covalent radius: 1223 pm
Van der Waals radius: 187 pm
  • Ga
  • Electron Configuration


There are two naturally occurring isotopes of gallium exist, 69Ga, and 71Ga.