Catalonia PAU Chemistry Practice Questions - Catalonia PAU Chemistry Examination - CIC Generalitat De Catalunya (Química 2n Batxillerat 2026) Exam

What is the correct ground-state electron configuration of a neutral chromium atom (Z = 24)?

[Ar] 4s² 3d⁴ [Ar] 3d⁵ 4s¹ [Ar] 4s² 3d⁵ [Ar] 3d⁶

Correct Answer:

[Ar] 3d⁵ 4s¹

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