Lithium is the lighest alkali metal but in aqueous solution , Li^(+) has the lowest mobility among alkali metals . Why so ?

Lithium is the lighest alkali metal but in aqueous solution , Li^(+) h

1.	Lithium is the lighest alkali metal but in aqueous solution , Li^(+) has the lowest mobility among alkali metals . Why so ?
Answer» Solution :Because of SMALLEST size AMONG alkali metals , `LI^(+)` ions are most highly hydrated in aqueous solution . As a result , among alkali metals , mass of hydrated LITHIUM ion is the highest and thus has lowest IONIC mobility .