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Of the following sets which one does NOT contain isoelectronic species?

1. BO3³−, CO3²−, NO3−
2. SO3²−, CO3²−, NO3−
3. CN−, N2, C2²−
4. PO4³−, SO4²−, ClO4−

Correct answer: SO3²−, CO3²−, NO3−

Solution

The set SO3²−, CO3²−, NO3− does not contain isoelectronic species because the total number of electrons in each ion is different: SO3²− has 26 electrons, CO3²− has 24 electrons, and NO3− has 24 electrons, thus they do not share the same electron configuration.

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