The Properties of Silicon in Metallic Silicon

Silicon is one of the semi metals, formerly known as "silicon". The melting point is 1420 ℃ and the density is 2.34g/cm3. Hard and brittle in texture. Insoluble in acids at room temperature, easily soluble in alkalis. The properties of metallic silicon are similar to those of germanium, lead, and tin, and have semiconductor properties. Silicon is extremely abundant in the Earth's crust, second only to oxygen and accounting for more than a quarter of the total weight of the Earth's crust. It exists in the form of silica or silicates. The purest silicon mineral is quartz or silica. There are two kinds of allotropy of silicon: one is dark brown amorphous powder, which is active and can burn in air; The other type is stable crystals (crystalline silicon). General silica and quartz are used for glass and other building materials, while high-quality quartz is used for making alloys, metals, and single crystals