What is the electron configuration for a gas phase +3 ion of iron (Z = 26)? | Atomic Structure

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Question

What is the electron configuration for a gas phase +3 ion of iron (Z = 26)?

[Ar] 3d 5

✓ Correct

[Ar] 4s₂ 3d 3

[Ar] 4s₁ 3d 4

[Ar] 4s₂ 3d 6

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