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The covalent character of any compound can be predicted on the basis of Fajans' Rule. Fajans' Rule, simply stated, says that a smaller cation can polarize a given anion better than a larger cation and that larger anions are more polarizable than smaller anions. $\ce{Li+}$ being a small cation polarizes $\ce{Cl-}$ to a good extent and since any amount of ...

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