"silicon-oxygen" is essentially meaningless.
Silica contains silicon and oxygen in the proportion 1:2, so is sometimes called "silicon dioxide", but it doesn't exist in the form of individual SiO2 molecules; they're bonded to each other in a large network.
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In silicon oxide (silicon-oxygen), each silicon atom is bonded to two oxygen atoms. Therefore, the ratio of silicon to oxygen atoms is 1:2.
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Quartz is rich in the element silicon. It is composed of silicon dioxide (SiO2).
The compound silicon monoxide (SiO) has only two atoms; one silicon atom, one oxygen. The prefix "mono" tells you there is only one oxygen attached; "bi" or "di" (such as in silicon dioxide) would tell you there are two oxygens (for total of three, in that example).
Silicon dioxide is composed of silicon and oxygen atoms in a 1:2 ratio. It is a common mineral found in many forms, including quartz and sand.
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