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The group having isoelectronic species is:

1. O²⁻, F⁻, Na⁺, Mg²⁺
2. O⁻, F⁻, Na, Mg⁺
3. O²⁻, F⁻, Na, Mg²⁺
4. O⁻, F⁻, Na⁺, Mg²⁺

Correct answer: O²⁻, F⁻, Na⁺, Mg²⁺

Solution

The correct option includes species that all have the same number of electrons, specifically 10 electrons each, making them isoelectronic. O²⁻, F⁻, Na⁺, and Mg²⁺ all correspond to the electron configuration of neon, which confirms their isoelectronic nature.

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