Atomic Number
31
Gallium is a chemical element with symbol Ga and atomic number 31. It is in group 13 of the periodic table, and thus has similarities to the other metals of the group, aluminium, indium, and thallium.
31
69.723 u
post transition
solid
5.91 g/cm³
2, 8, 18, 3
Protons: 31 • Electrons: 31 • Neutrons: Varies by isotope
Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p¹
1875 • Lecoq de Boisbaudran