Mg2+ is smaller than O2- in size, though both have same electronic con – InterviewSolution

1.	Mg2+ is smaller than O2- in size, though both have same electronic configuration. Give reason.
Answer» Mg²⁺ and O^2- both have 10 electrons and Mg²⁺ having 12 protons in its nucleus (O^2-has 8 protons) exerts higher effective nuclear charge and thus shells are more effectively pulled in Mg²⁺ resulting to smaller size than O^2-.

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