Aluminum

Name Aluminum
Symbol Al
Atomic Weight 26.981538
Atomic Number 13
CAS ID 7429-90-5
Group Number 13
Group Name (none)
Period Number 3
Origin of Name Latin, alumen = "alum."
Year Discovered 1825
Discovery Credits Hans Christian Oersted at Copenhagen, Denmark.
Class Metallic
Color Silvery
Standard State Solid at 77 F & 298 K
Description Hard, strong, silvery-white metal, protected by oxide film from reacting with air and water. Soluble in hot concentrated HCL and NaOH solution. Hundreds of uses as metal and alloys in aircraft, construction industry, containers, foil, etc.

Diagnostic tests:
The presence of Al (>10%) in most light-colored infusible minerals can be detected by the blue color which they assume when heated, then moistened with a CoNO3 solution and reheated.
From solutions, Al will be precipitated as a flocculent white or colorless precipitate on the addition of NH4OH solution.

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