Diamond: , 4 covalent bonds between C atoms, Tetrahedral structure, Used for cutting and drilling, Does not conduct electricity, Graphite: , 3 covalent bonds between C atoms, Layered structure with weak attractions between layers, Used as a lubricant in industrial machinery, Free/delocalised electrons so can conduct electricity, Silicon dioxide: , Tetrahedral arrangement Si and O atoms, Contains only covalent bonds, Cannot conduct electricity and is used as an electrical insulator, Found in sand,

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