Ionic mobility of alkali metal ions in aqueous solution is maximum for

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Strategy:
 Ionic mobility in water depends on the "hydrated radius". Small ions have higher charge density and attract more water molecules, making them larger and slower.

Step 1: Contrast bare vs hydrated sizes
- Bare Size: .
- Charge Density:  has the highest density;  have the lowest.

Step 2: Hydration effect
Lithium forms a massive hydration shell and moves slowly. Rubidium (), being larger and having lower density, attracts fewer water molecules. Its hydrated radius is the smallest among

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