The species O^2-, F-, Na+, and Mg^2+ all have 10 electrons (isoelectronic with Ne).
Which has the smallest ionic radius?
- Acheck_circle
Mg^2+
- B
F-
- C
Na+
- D
O^2-
Explanation
Among isoelectronic species, the one with the highest nuclear charge (Mg = +12) pulls the same 10 electrons in tightest.