Elemental aluminum. Aluminum is a metallic element with symbol Al and atomic number 13. Its simple materials is a silvery white light metal. It has plasticity. Commodities are often made into bars, sheets, foils, powders, tapes and wires. An oxide film can be formed in humid air to prevent metal corrosion. Aluminum powder can burn violently when heated in air, and give off a dazzling 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. The melting point is 660℃. The boiling point is 2327℃. The content of aluminum in the earth's crust is the third only to oxygen and silicon, and it is the most abundant metal element in the earth's crust. The development of three important industries, aviation, construction and automobile, requires that aluminum and its alloys have unique properties, which is of great benefit to the production and application of this new metal aluminum. It is widely used.