Answer:
The positive charge density around \[L{{i}^{+}}\]
ion is quite high due to its very small size. It can attract several layers of
water molecules and gets highly hydrated. Thus,\[L{{i}^{+}}\,(aq)\] ion is
bigger in size compared with other alkali metal ions which are less hydrated.
As a result, it moves through the aqueous solution less rapidly compared with
ions of other alkali metals under the influence of electric current.
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