Andalusia PAU Chemistry Practice Questions - Andalusia PAU Chemistry (Química 2o Bachillerato) Exam

What is the ground-state electron configuration of the Fe²⁺ ion (atomic number Z = 26)?

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

Correct Answer:

[Ar] 3d⁶

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