Castilla-La Mancha PAU Chemistry (Química - UCLM 2026) Practice Questions - Castilla-La Mancha PAU Chemistry (Química - UCLM 2026) Exam

What is the ground-state electron configuration of the Fe³⁺ ion (Z = 26)?

[Ar] 4s² 3d³ [Ar] 3d⁵ [Ar] 4s¹ 3d⁴ [Ar] 3d⁶

Correct Answer:

[Ar] 3d⁵

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