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Correct Answer: D) n = 3, ℓ = 2, mℓ = +1, mₛ = +½
Using the (n + ℓ) rule: 4s → 4 3s → 3 3p → 4 3d → 5 The orbital with the highest (n + ℓ) value has the highest energy. Therefore, 3d is highest.