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Periodic Table Isoelectronic Species and Ionic Radius

1

Choose the best answer

Br⁻, Rb⁺ and Sr²⁺ are isoelectronic. Their radii decrease in the order:

Verified Answer & Explanation⌄

Correct Answer: B) Br⁻ > Rb⁺ > Sr²⁺

Concept Explanation

For isoelectronic species, greater nuclear charge attracts the same electron cloud more strongly, so radius decreases as nuclear charge increases.

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