I was wondering why silicon dioxide tends to be a covalent bond instead of an ionic bond. Based on lewis structures, the octet rule seems to work for silicon dioxide so shouldn't it also be an ionic bond?
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$\begingroup$ Losing four electrons to form a $\ce{Si^{4+}}$ is quite unlikely and requires a lot of energy to do so. $\endgroup$– Pritt says Reinstate MonicaCommented Mar 30, 2018 at 5:38
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$\begingroup$ How does covalent bonding require less energy? $\endgroup$– ChemPsychoCommented Mar 30, 2018 at 15:55
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1 Answer
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Because silicon and oxygen are nonmetals on the period, hence they form covalent bonds. For ionic bonding, it must be between a metal and a nonmetal.
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2$\begingroup$ You might want to add a word or two about electronegativity. $\endgroup$ Commented Mar 30, 2018 at 4:39
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1$\begingroup$ "It must be a metal and a nonmetal", like ammonium chloride? $\endgroup$ Commented Mar 30, 2018 at 9:56