Which of the following are isoelectronic: N³⁻, O²⁻, F⁻, Na⁺, Mg²⁺?

University of Ilorin CHM101 2023 past question

1. All of them
2. Only N³⁻, O²⁻, and F⁻
3. N³⁻, O²⁻, F⁻, and Na⁺
4. N³⁻, O²⁻, F⁻, Na⁺, and Mg²⁺

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