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Verified Answer & Explanation⌄

Correct Answer: A) 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s

Concept Explanation

According to the Aufbau principle and n + l rule, the order is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s. Lower-energy subshells fill first.

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