ЦТ Chemistry Practice Questions - ЦТ ЦЭ Chemistry (Belarus Centralized Testing Centralized Exam) Exam

Which of the following represents the anomalous ground-state electron configuration of a neutral copper atom (₂₉Cu)?

[Ar] 3d⁹ 4s² [Ar] 3d⁸ 4s² 4p¹ [Ar] 3d¹⁰ 4s¹ [Ar] 3d¹⁰ 4p¹

Correct Answer:

[Ar] 3d¹⁰ 4s¹

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