Which of the following alkali metal ions has | vedclass

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(D) In an aqueous solution,alkali metal ions are hydrated. The extent of hydration depends on the size of the ion. Smaller ions have a higher charge d

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$Li^{+}$

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(D) In an aqueous solution,alkali metal ions are hydrated. The extent of hydration depends on the size of the ion. Smaller ions have a higher charge density and thus get more heavily hydrated. The order of ionic size is $Li^{+} The order of degree of hydration is $Li^{+} > Na^{+} > K^{+} > Rb^{+} > Cs^{+}$. Because $Li^{+}$ is the smallest,it is the most heavily hydrated,resulting in a larger hydrated radius. $A$ larger hydrated radius leads to lower ionic mobility in an aqueous solution. Therefore,$Li^{+}$ has the lowest ionic mobility.

Which of the following alkali metal ions has the lowest ionic mobility in an aqueous solution?

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