Illustrated are four ions-A, B, X, and Y- showing their relative ionic radii. The ions shown in red carry positive charges: a

2+ charge for A and a 1+ charge for B. Ions shown in blue carry negative charges: a 1- charge for X and a 2- charge for Y.
(a) Which combinations of these ions produce ionic compounds where there is a ratio of cations and anions?
(b) Among the combinations in part (a), which leads to the ionic compound having the largest lattice energy?
(c) Which combination of ions leads to the ionic compound having the smallest lattice energy?

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