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Which one of the following constitutes a group of the isoelectronic species?

1. C2²−, O2^−, CO, NO
2. NO⁺, C2^−, CN^−, N2
3. CN^−, N2, O2²−, C2²−
4. N2, O2, NO⁺, CO

Correct answer: NO⁺, C2^−, CN^−, N2

Solution

Isoelectronic species have equal electron counts. NO+ , C2^2-, CN- and N2 each have 14 electrons, so they form the isoelectronic group (option as written shows a typo C2^- for C2^2-). The stored set contains O2 (16 e), so it cannot be isoelectronic with CO/N2.

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