gallium

Name gallium
Symbol Ga
Atomic Weight 69.723
Atomic Number 31
CAS ID 7440-55-3
Group Number 13
Group Name (none)
Period Number 4
Origin of Name Latin, Gallia = "France."
Year Discovered 1875
Discovery Credits Discovered by Paul-Emile Lacoq de Boisbaudran at Paris, France.
Class Metallic
Color Silvery White
Standard State Solid at 77 F & 298 K (Melts slightly above this temperature)
Description Soft, silvery-white metal, stable in air and with water. Soluble in acids and alkalis. Longest liquid range of all elements. Semiconductor properties with nitrogen, phosphorus, arsenic, and antimony. Used in light-emitting diodes; microwave equipment.

Diagnostic tests: 
there are no simple chemical tests for gallium. Atomic Absorption Spectroscopy is used for quantitative analysis and Energy Dispersive Analysis of X-rays (EDAX) is used for qualitative analysis.

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