NEETprep Helpline
Consider the isoelectronic species, Na+, Mg2+, F-, and O2-. The correct order of increasing length of their radii is
1. F-<O2-<Mg2+<Na+
2. Mg2+<Na+<F-<O2-
3. O2-<F-<Na+<Mg2+
4. O2-<F-<Mg2+<Na+
Hint: In isoelectronic species anion is larger than cation
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