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Melting points of NaF and MgO

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The ions of NaF and MgO are isoelectronic, and the intermolecular distances are about the same (235 pm and 212 pm, respectively). Why then are the melting points of NaF and MgO so different (992 degrees C and 2643 degrees C, respectively)?

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The solution explains why melting points of NaF and MgO are different.

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The ions are held together by Coulomb attractions. Positive and negative particles attract one another.
Thus in NaF the positive particle is the Na ion (with charge +) and the negative particle is the F ion (with charge -).
In MgO the positive particle is the ...

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