SONY DSCAluminum is the chemical element with the symbol Al and atomic number 13. It belongs to the group IIIA (13) of the periodic system among with boron. It is the most abundant metal in the Earth’s crust and overall the third (3rd) most abundant chemical element in total on our planet after oxygen and silicon. Weight is about 8% of the crust’s. However it is highly reactive chemical that is found in nature as a free metal. Conversely, it is bonded to more than 270 different minerals. The main source for the manufacture of the metal is bauxite. The metal aluminum has (seemingly) great ability to resist corrosion. This essentially is because the exposure of the metal in the atmosphere forms briefly one minute surface, invisible, layer of oxide, which prevents deeper erosion (phenomenon of passivation). Also, because of its relatively low density and large capacity to create a wide variety of alloys, it became a strategic metal for the aerospace industry (and not only) industry. It is also extremely useful in the chemical industry both as such as a catalyst, and in the form of various associations.