Chemical symbol Al. Element No. 13 on the periodic chart. Aluminum is a white-silver metal with an atomic weight 26.97, a melting point of 660°C (1220 °F), and a boiling point of approximately 2270°C (4118 °F). It is stable against normal atmospheric corrosion, but attacked by both acids and alkalis. Aluminum is light weight, ductile, malleable, and conducts electricity with very little resistance. Aluminum is often alloyed with other metals to improve its tensile strength and resistance to acids and alkalis. Pure aluminum is refined from alumina, a common oxide found in bauxite ore. Aluminum is second only to steel in consumption. Aluminum is heavily used in the transportation, packaging, building, electronics industries. Its principle uses in steel making include: deoxidation, restricting grain growth (by forming dispersed oxides or nitrides), and as an alloying element in nitriding steel.