The compounds MgO, NaF, and RbI are organized in ascending order of lattice energy.
Smaller ions have bigger charges, which results in more lattice energy. thus possesses the highest lattice energy.
Radius of the ions has an inverse relationship with lattice energy. Magnesium ions are smaller than calcium ions in size. As a result, lithium fluoride has the lowest lattice energy and magnesium oxide has the greatest.
In conclusion, lattice energy rises as ion charge rises and distance falls. More specifically, it rises from bottom to top up groups and from left to right across periods.
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