Silicon can be found in the sun and stars and is the main part of meteorites. Silicon makes up 25.7 percent of the Earth's crust, but it is not found free in nature.
Silicon can be found on the periodic table under its atomic number of 14 and its atomic weight of 28.0855. It is the seventh most abundant element in the universe and the second most abundant element in the Earth's crust. Silicon can be made by heating sand and carbon. Amorphous silicon and crystalline silicon are two allotropes that exist at room temperature. Silicon dioxide is silicon's most common compound and the most abundant compound in the Earth's crust. It is commonly found as sand.