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(C) The lattice energy of an ionic compound is directly proportional to the product of the charges of the ions and inversely proportional to the inter

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$AlN$

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(C) The lattice energy of an ionic compound is directly proportional to the product of the charges of the ions and inversely proportional to the inter-ionic distance (sum of ionic radii).$Lattice \, Energy \propto \frac{|q_+ 	imes q_-|}{r_+ + r_-}$Comparing the charges:$NaF$: $Na^+ (+1), F^- (-1) ightarrow 	ext{Product of charges} = 1$$MgF_2$: $Mg^{2+} (+2), F^- (-1) ightarrow 	ext{Product of charges} = 2$$AlF_3$: $Al^{3+} (+3), F^- (-1) ightarrow 	ext{Product of charges} = 3$$AlN$: $Al^{3+} (+3), N^{3-} (-3) ightarrow 	ext{Product of charges} = 9$Since $AlN$ has the highest product of charges and the ions ($Al^{3+}$ and $N^{3-}$) are relatively small,it possesses the largest lattice energy.

Which ionic compound has the largest amount of lattice energy?

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