Chemistry – Melting Point

why does BeO (beryllium oxide) have a higher melting point than LiF (lithium fluoride)?
BeO and LiF both are ionic compounds. The charges on Be is +2 and on O is -2 in the compound BeO. Li has +1 and F has -1 charges in the compound LiF.
Stronger ionic attraction is operative for BeO as higher charges are involved in comparison to LiF. Hence, BeO has more lattice energy than LiF. Therefore, more energy is needed to break the lattice.
Thus, BeO has higher melting point than LiF.

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