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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.
Facts About Silicon. 1  Atomic Number (number of protons in the nucleus): 14. 2  Atomic Symbol (on the Periodic Table of Elements): Si. 3  Atomic Weight (average mass of the atom): 28.09. 4  Density: 2.3296 grams per cubic centimeter. 5  Phase at Room Temperature: Soild. 6  Melting Point: 2577 degrees Fahrenheit (1414 degrees Celsius)