What is the ground-state electron configuration of a gas-phase Mn2+ ion? | Atomic Structure

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Question

What is the ground-state electron configuration of a gas-phase Mn²⁺ ion?

1s₂ 2s₂ 2p₆ 3s₂ 3p₆ 3d₅

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1s₂ 2s₂ 2p₆ 3s₂ 3p₆ 3d₃ 4s₂

1s₂ 2s₂ 2p₆ 3s₂ 3p₆ 3d₇

1s₂ 2s₂ 2p₆ 3s₂ 3p₆ 3d₅ 4s₂

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