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Silicon is the eighth most common element in the universe by mass, but very rarely occurs as the pure element in the Earth's crust. It is most widely distributed in dusts, sands, planetoids, and planets as various forms of silicon dioxide (silica) or silicates.
Part of the Computing fundamentals glossary: Silicon is a chemical element (its symbol in chemical formula expressions is Si) that is present in sand and glass and which is the best known semiconductor material in electronic components. Its atomic number is 14.