Answer:
\[{{I}^{-}}\]ion has a bigger size
than the \[{{F}^{-}}\] ion. It can be more readily polarised by \[L{{i}^{+}}\]
ion than by\[{{F}^{-}}\]ion. As a result, \[L{{i}^{+}}\] and \[{{F}^{-}}\] ions
come quite close and neutralise their charge to a large extent resulting in
covalent compound. On the other hand, \[L{{i}^{+}}\] and \[{{F}^{-}}\] ions are
not in a position to neutralise their charge and LiF is mainly ionic.
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