| 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: |