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Why the melting points of `NaF` and `MgO` `(990^(@)C` and `2640^(@)C`) are so different although both have same number of electrons and nearly the same internuclear distance (236 pm and 216 pm)?

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`MgO` is a bi-bivalent `(+2, -2)` compound whereas `NaF` is a uni-univalent `(+1, -1)`, compound. Hence, force of electrostatic attraction in `MgO` is stronger.

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