Key information
Atomic number: 
31
Atomic weight: 
69.72
Density: 
5910 kg/m³
Boiling point: 
2510.16° K
Melting point: 
302.96° K

Gallium is a solid at room temperature but as with mercury, caesium and rubidium becomes liquid when heated slightly.Gallium is a metal that commonly occurs with aluminium ore and may be produced as a by-product of aluminium manufacture. Gallium combined with arsenic, or with indium and arsenic is used in semi-conductor applications. It is used in mobile phones, satellite communications, microwave point-to-point links, and some radar systems.

Electron Shell: 
Amazon Books
Image of The Last Sorcerers: The Path from Alchemy to the Periodic Table
Author: National Academy of Sciences, Richard Morris
Publisher: Henry (Joseph) Press (2003)
Binding: Hardcover, 294 pages