Madrid PAU Chemistry Practice Questions - Madrid PAU Chemistry Examination 2026 (Química 2o Bachillerato) Exam

What is the ground-state electron configuration of a neutral copper atom (Cu, Z = 29)?

[Ar] 4s¹ 3d¹⁰ [Ar] 4s² 3d⁹ [Ar] 4s⁰ 3d¹¹ [Ar] 4s² 3d¹⁰

Correct Answer:

[Ar] 4s¹ 3d¹⁰

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