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    I know this is easy in the world of sixth form, but I'd just like a more firmer understanding of the concept;

    "Carbon and silicon both form oxides with the general formula XO2. However, CO2 is a simple covalent compound, and a gas at room temperature, whilst SiO2 is a giant covalent compound, and a solid at room temperature. Explain why."

    I know it has something to do with atomic radius, but why is it that because SiO2 has a larger atomic radius, it has a higher melting point??

    Agh I'm just confused, please help!
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    Sorry please atomic number of carbon is 6 so number of electrons in co2 (6+8×2) and sio2 number of electrons(14+8×2)

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