Multiple choice Which of the following sets represents isoelectronic species only? Mg2+, S2-, F-, Na+ Ca2+, O2-, Cl-, K+ Mg2+, O2-, F-, K+ Ca2+, S2-, Cl-, K+ Mg2+, S2-, Cl-, Na+ Reveal answer Fill a bubble to check yourself B Correct answer Explanation All are isoelectronic.