The ions of \( \mathrm{NaF} \) and \( \mathrm{MgO} \) all have the same number of electrons and ...

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The ions of \( \mathrm{NaF} \) and \( \mathrm{MgO} \) all have the same number of electrons and internuclear distances are about the same \( (235 \mathrm{pm} \) and \( 215 \mathrm{pm}) \), why then are the melting points of \( \mathrm{NaF} \) and \( \mathrm{MgO} \), so different \( \left(992^{\circ} \mathrm{C}\right. \) and \( \left.2642^{\circ} \mathrm{C}\right) \) ?
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