Chemical symbol for aluminum

Aluminum is a kind of metal element, the element symbol is AI, is a silver white light metal. It is malleable. Commodities are often made in rod, flake, foil, powder, ribbon and silk form. In moist air, an oxide film can be formed to prevent metal corrosion. The aluminum powder burns violently with heat in the air and emits a blinding white flame. Soluble in dilute sulfuric acid, nitric acid, hydrochloric acid, sodium hydroxide and potassium hydroxide solution, insoluble in water. The relative density is 2.70. Melting point 660℃. Boiling point 2327℃. The content of aluminum in the crust is second only to oxygen and silicon, ranking third, and is the most abundant metal element in the crust. The development of three important industries, aviation, construction and automotive, requires material characteristics with the unique properties of aluminum and its alloys, which greatly facilitates the production and application of this new metal aluminum. It is widely used.

The most abundant metallic element in the Earth's crust, with a content of 8.3%. It mainly exists in aluminosilicate ores, as well as bauxite and cryolite. Alumina is a white amorphous powder, it has a variety of variants, of which the most familiar is α-AlzO3 and β-Al2O3, corundum exists in nature is A-al2o3, its hardness is second only to diamond, high melting point, acid and alkali resistance, commonly used to make some bearings, manufacturing abrades, refractories. Such as corundum crucible, can withstand 1800℃ high temperature. Al2O3 has a variety of colors due to the presence of different impurities. For example, a trace of Cr (III) is red and is called ruby; Those containing Fe (II, Fe (III) or Ti (IV) are called sapphires.

Chemical properties:

Aluminum is an active metal, and a dense oxide film about 50 angms thick (1 angms =0.1 nanometers) is immediately formed on the surface of aluminum in dry air, so that aluminum will not be further oxidized and resistant to water; But aluminum powder is very flammable when mixed with air; Molten aluminum can react violently with water; Aluminum is amphoteric, highly soluble in strong bases, but also soluble in dilute acids.