Answer:
In MgO, both the ions are divalent in nature (\[M{{g}^{2+}}\] and \[{{O}^{2-}}\]) while in NaF, these are of monovalent nature (\[N{{a}^{+}}\] and\[{{F}^{-}}\]).The electrostatic forces among the ions in the crystal lattice of MgO are stronger than in case of NaF. Therefore, the melting point of MgO is higher (2642°C) as compared to NaF (992°C).
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