Test Academy | Which one of the following sets of ions represents a collection of isoelectronic species? (Atomic nos.: F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21) K+, Ca2+, Sc3+, Cl–, Na+, Ca2+ , Sc3+, F–, K+, Cl–, Mg2+, Sc3+, Na+, Mg2+, Al3+, Cl

Question

Which one of the following sets of ions represents a collection of isoelectronic species? (Atomic nos.: F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21)

Options :

K+, Ca2+, Sc3+, Cl–
Na+, Ca2+ , Sc3+, F–
K+, Cl–, Mg2+, Sc3+
Na+, Mg2+, Al3+, Cl–

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