Which one of the following sets of ions represents a collection of isoelectronic species?

For Competitive Exams

K⁺, Cl^–, Ca²⁺, Sc³⁺

Ba²⁺, Sr²⁺, K⁺, S^2–

N^3–, O^2–, F^–, S^2–

Li⁺, Na⁺, Mg²⁺, Ca²⁺

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Bond order of 1.5 is shown by

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