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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.
The atomic number of silicon (Si) is 14. The atomic weight of Si is 28.0855 grams per mole. See the Web Links and the Related Questions to the below this answer for a periodic table and more information about this element. 2 people found this useful.