Chemistry - PERIODIC TABLE Question with Solution | TestHub

In aqueous medium, the size depends on the hydrated radius of the ions rather than their bare gaseous size. The extent of hydration is directly proportional to the charge density (charge / size) of the ion. Be²⁺ has a smaller size and a higher positive charge compared to Li⁺, giving it a much higher charge density. This high charge density allows Be²⁺ to strongly attract a larger hydration sphere of water molecules around it. Consequently, the hydrated radius of Be²⁺(aq) becomes larger than that of Li⁺(aq), making the order Be²⁺(aq) > Li⁺(aq) correct.