Which ionic solid would require the most energy to form gaseous ions?

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$MgO$

$NaF$

${Na}_{2} O$

${MgF}_{2}$

answer is C.

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Detailed Solution

Ionic solid would require the most energy to form gaseous ions is Magnesium oxide ( $MgO$ )

The attraction between the ions with opposing charges determines the lattice energy.

A measurement of the energy held within a compound's crystal lattice, equivalent to the energy released if the constituent ions were brought together from infinity.

Hence, option C is correct.

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