Aluminium metal itself is highly reactive but is protected by a thin transparent layer of the oxide, which forms quickly in air. Aluminium andits oxide are amphoteric.
Aluminum metal , is a chemical element in the boron group with the symbol Al and atomic number 13. The element has a silvery white, soft, ductile metal. It is also the third most common element in the world, it is also the most abundant metal in the earth's crust. It is commonly used in the preparation of other aluminum salts.