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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.
Summary. Next to oxygen, silicon is the most abundant element on Earth. With four electrons in its outer shell, it readily combines with oxygen to form silicon dioxide. This compound, also known as silica, is the most common substance found in the Earth's crust and is the main ingredient in sand.Silicon is a metalloid, which means it and other metalloid elements have properties that are in between metals and non-metals, depending on what they combine with.ilicon can have properties like a metal or a non-metal depending on what other elements it combines with. Glass is a very common silicon compound that has non-metal qualities, while the silicon used in electronics can be made to act very much like a metal.