Carbon has ability to form stable bonding with itself and other small atoms like oxygen and nitrogen due to its small size.it carbon dioxide each oxygen atom is double-bonded with the carbon atom with overlapping.
The silicon cannot form stable bonding due to its large size. It forms four single covalent bonds with oxygen atoms. Each oxygen atom is linked with two Si atoms. Thus, a large giant molecule of 3-d tetrahedral structure comes into existence.
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