Aluminum (or, Aluminium) is a chemical element in the boron group with symbol Al and atomic number 13. It is a silvery white, soft, ductile metal. Aluminum is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth’s crust.
It makes up about 8% by weight of the Earth’s solid surface. Aluminum is the most widely used non-ferrous metal. Global production of aluminum in 2005 was 31.9 million tons. This amount of production exceeded that of any other metal except iron.