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Silicon dioxide is an inorganic compound with a chemical formula of SiO2. Silicon atoms and oxygen atoms are arranged in a long-range order to form crystalline silicon dioxide, and short-range order or long-range disorder are arranged to form amorphous silicon dioxide.In the silicon dioxide crystal, the silicon atom is located at the center of the regular tetrahedron, and the four oxygen atoms are located at the four corners of the regular tetrahedron. Many such tetrahedrons are connected by the oxygen atoms at the corners. Each oxygen atom isThe two tetrahedrons share that each oxygen atom is bound to two silicon atoms.The simplest formula of silicon dioxide is SiO2, but SiO2 does not represent a simple molecule (it only represents the ratio of the number of atoms of silicon and oxygen in the silicon dioxide crystal).Pure natural silicon dioxide crystal is a hard, brittle, insoluble, colorless and transparent solid, often used in the manufacture of optical instruments, etc.