Mg2+ ions is smaller than O2- ion although both are iso-electronic. – InterviewSolution

1.	Mg2+ ions is smaller than O2- ion although both are iso-electronic. Explain.
Answer» Mg²⁺ ion is smaller than O^2- ion though both are iso-electronic. The nuclear charge in Mg²⁺ is + 12 and O^2- is + 8, so with the increase in nuclear charge the size decreases and, hence O^2- > Mg²⁺.

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