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Silicon is a chemical element, and its chemical symbol is Si, formerly known as silicon. The atomic number is 14 and the relative atomic mass is 28.0855. There are two kinds of allotropes, amorphous silicon and crystalline silicon, which belong to the metal elements of group IVA in the third period of the periodic table of elements.

Silicon is also a very common element, however, it rarely appears in the form of simple substance in nature, but widely exists in rocks, gravel and dust in the form of composite silicate or silica. Silicon ranks eighth in the universe. In the crust, it is the second most abundant element, accounting for 26.4% of the total mass of the crust, second only to the first oxygen (49.4%).