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The isoelectronic set of ions is :

1. F – , Li + , Na + and Mg 2+
2. Li + , Na + , O 2– and F –
3. N 3– , O 2– , F – and Na +
4. N 3– , Li + , Mg 2+ and O 2–

Correct answer: N 3– , O 2– , F – and Na +

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