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Which one of the following sets of ions represents a collection of isoelectronic species? [AIEEE 2006
1) K+, Cl–, Ca2+, Sc3+
2) Ba2+, Sr2+, K+, S2–
3) N3–, O2–, F–, S2–
4) Li+, Na+, Mg2+, Ca2+
1) K+, Cl–, Ca2+, Sc3+