Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?

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🧠 The Hydration Paradox
In the gas phase, the smallest ion () is the fastest. But in water, things change. Small ions have a very high charge density, acting like strong magnets that attract a massive "cushion" of water molecules.

🗺️ The Aqueous Sprint
1. Charge Density:  is the smallest in Group 1. Its small size results in a very high surface charge density.
2. Hydration: Because of this high density,  attracts a large number of water molecules, forming a massive hydration shell.
3. Effecti

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