Which one of the following constitutes a group of the isoelectronic species?
CO2–
2, O–
2, CO, NO
2, O–
2, CO, NO
NO+, C2–
2, CN–, N2
2, CN–, N2
CN–, N2, O2–
2, C2–
2
2, C2–
2
N2, O–
2, NO+, CO
2, NO+, CO
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