OBQ Practice Questions - Olimpíada Brasileira De Química Exam

What is the ground-state electronic configuration of the gaseous iron(III) cation, Fe3+ (atomic number Z = 26)?

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

[Ar] 3d5

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