Castilla Y León PAU Chemistry Practice Questions - Castilla Y León PAU Chemistry (Química 2o Bachillerato) Exam

What is the ground-state electron configuration of a neutral iron atom (Fe, atomic number Z = 26)?

[Ar] 3d⁶ 4s² [Ar] 3d⁸ [Ar] 3d⁵ 4s³ [Ar] 4s² 4p⁶

Correct Answer:

[Ar] 3d⁶ 4s²

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