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Atomic Structure Exceptions to Aufbau Principle

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Which pair consists of well-known exceptions to the simple Aufbau prediction?

Verified Answer & Explanation⌄

Correct Answer: B) Cu and Ag

Concept Explanation

Cu and Ag both favor a filled d-subshell: Cu: [Ar] 3d¹⁰ 4s¹ Ag: [Kr] 4d¹⁰ 5s¹ Therefore, both deviate from the simplest expected Aufbau pattern.

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