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One way to define lattice energy is that it is the energy required to break ionic attractions in a solid to form gaseous ions. In other words, if AB is an ionic solid, the lattice energy is the enthalpy change for the following reaction:

$$AB\ _{(s)}\rightarrow { A }^{ n+ }\ _{(g)}\ +\ { B }^{ m- }\ _{(g)}$$

Given this information, which of the following would be expected to have the highest lattice energy?

A

MgO

B

CaO

C

SrO

D

BaO

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