PAU Chemistry (Cantabria) Practice Questions - Cantabria PAU Chemistry 2026 (Pruebas De Acceso A La Universidad, Universidad De Cantabria) Exam

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

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

Correct Answer:

[Ar] 4s¹ 3d¹⁰

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