IB Chemistry HL Practice Questions - IB Diploma Chemistry Higher Level Exam

Which is the correct ground-state electron configuration of chromium (Z = 24)?

[Ar] 3d5 4s1 [Ar] 3d4 4s2 [Ar] 3d6 [Ar] 4s2 4p4

[Ar] 3d5 4s1

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