 |
| 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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