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First of all mobility is observed in any solution, so i am concedering Aqueous solution of alkaline metals.
The alkali metal ion exist as hydrated ions
M+(H2O) -
in the aqueous solution. The degree of hydration, decreases with ionic size as we go down the group. Hence Li+ ion is mostly hydrated e.g. [Li(H2O) 6]. Since the mobility of ions is inversely proportional to the size of the their hydrated ions, hence the increasing order of ionic mobility is
Li+
Because as we come down the periodic table the size of hydrathed alkaline metal decreases.
Regards
Arun (askIITians forum expert)
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