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All species are isoelectronic (10e−). Isoelectronic series, when negative charge increases the radius of ion increases. Mg2+ < Na+ < F− < O2−

1. Mg2+ < Na+ < F− < O2−
2. O2− < F− < Na+ < Mg2+
3. Na+ < Mg2+ < O2− < F−
4. Mg2+ < F− < Na+ < O2−

Correct answer: Mg2+ < Na+ < F− < O2−

Solution

The correct option reflects the increasing ionic radius as the negative charge increases in an isoelectronic series. As more electrons are added, the electron-electron repulsion increases, leading to a larger radius, which is accurately represented by the order Mg2+ (smallest) to O2− (largest).

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