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Which of the following pair of ions have same outer electronic configuration

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Ce⁺⁴, Lu⁺³

Ce⁺⁴, Eu⁺²

Eu⁺², Gd⁺²

Eu⁺², Gd⁺³

answer is D.

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Detailed Solution

Ce⁺⁴: [Xe]4f⁰5d⁰6s⁰

Lu⁺³: [Xe]4f¹⁴5d⁰6s⁰

Eu⁺²: [Xe]4f⁷5d⁰6s⁰

Gd⁺²: [Xe]4f⁷5d¹6s⁰

Gd⁺³: [Xe]4f⁷5d⁰6s⁰

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