Engineering Board Exam Reviewer · Chemistry · medium

What is the ground-state electron configuration of iron (Z = 26)?

1. [ Ar] 4s2 3d8
2. [ Ar] 3d8
3. [ Ar] 4s2 3d6
4. [ Kr] 4s2 3d6

Answer

C. [ Ar] 4s2 3d6

Solution

Fe: 1s2 2s2 2p6 3s2 3p6 4s2 3d6.

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