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    I thought that SiO2 would have a higher melting point than MgO because it forms a giant covalent structure whereas MgO only forms a giant ionic structure but this isn't the case as the melting point for MgO is higher. can someone tell me why?
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    The ionic bonds in MgO must be stronger than the covalent bonds in SiO2.
 
 
 
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Updated: November 9, 2017

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