Silicon

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Silicon (play /ˈsɪlɪkən/ SIL-ə-kən or /ˈsɪlɪkɒn/ SIL-ə-kon; Latin: silicium) is the most common metalloid. It is a chemical element, which has the symbol Si and atomic number 14. A tetravalent metalloid, it is less reactive than its chemical analog carbon.

Silicon is the eighth most common element in the universe by mass, but very rarely occurs as the pure free element in nature. It is more widely distributed in dusts, sands, planetoids and planets as various forms of silicon dioxide (silica) or silicates. In Earth's crust, silicon is the second most abundant element after oxygen, making up 27.7% of the crust by mass.[4]

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