Which one of the following fluorides of alkal | vedclass

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(A) The lattice energy is inversely proportional to the inter-ionic distance (sum of the radii of the cation and anion). Since the fluoride ion $(F^-)

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$LiF$

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(A) The lattice energy is inversely proportional to the inter-ionic distance (sum of the radii of the cation and anion). Since the fluoride ion $(F^-)$ is common to all,the lattice energy depends on the size of the alkali metal cation. As the size of the cation increases from $Li^+$ to $Cs^+$,the inter-ionic distance increases,and the lattice energy decreases. Therefore,$Li^+$ (being the smallest cation) forms the fluoride with the highest lattice energy,which is $LiF$.

Which one of the following fluorides of alkali metals has the highest lattice energy?

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