Isoelectric series:
Mg2+<Na+<F−<O2−
All have 10 electrons. In the isoelectronic series, the proton/electron ratio decreases, so the size decrease because Zeff increases on decrease proton/electron ratio.
For Na+,Mg2+,F− and O2−, the correct order of increasing ionic radii is:
Held on 15 Apr 2018 · Verified 6 Jul 2026.
O2−<F−<Na+<Mg2+
Na+<Mg2+<F−<O2−
Mg2+<Na+<F−<O2−
Mg2+<O2−<Na+<F−
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