Which is the smallest among Na+, Mg2+, Al3+ and why? - Vidyadip

Question

Which is the smallest among Na⁺, Mg²⁺, Al³⁺ and why?

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Answer

Al³⁺ is smallest because it has the highest number of protons (13) among Na⁺, Mg²⁺ and Al³⁺ ions, due to which effective nuclear charge is maximum.

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