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Aluminium (or aluminum ; see different endings ) is a chemical element in the boron group with symbol Al and atomic number 13. It is a silvery-white, soft, nonmagnetic, ductile metal . Aluminium 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 mass of the crust, though it is less common in the mantle below. Aluminium metal is so chemically reactive that native specimens are rare and limited to extreme reducing e
Aluminium is remarkable for the metal's low density and for its ability to resist corrosion due to the phenomenon of passivation . Structural components made from aluminium and its alloys are vital to the aerospace industry and are important in other areas of transportation and structural materials, such as building facades and window frames. The most useful compounds of aluminium, at least on a weight basis, are the oxides and sulfates .
Aluminum is everywhere. From airplanes to cooking pans, this versatile, light-weight metal has been around for generations. And its many benefits have made life easier and more convenient for millions of people. But a new documentary portrays what the filmmaker describes as the "dark side" of aluminum. VOA's Julie Taboh attended the movie's world premiere at a Washington film festival and has this report.