Galicia PAU Chemistry Química 2o Bachillerato CIUG Practice Questions - Galicia PAU Chemistry Química 2o Bachillerato CIUG 2026 (Probas D'Acceso á Universidade) Exam

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

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

Correct Answer:

[Ar] 3d⁵

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