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Why is lithium iodide more covalent than...

Why is lithium iodide more covalent than lithium fluoride ?

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According to Fazan's rule, `Li^(+)` ion can polarise `I^(-)` ion more than the `F^(-)` ion because of the bigger size of the anion. Therefore, lithium iodide (LiI) has more covalent character than lithium fluoride (LiF).
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