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Atomic Structure Aufbau Principle and n + ℓ Rule

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According to the Aufbau principle, which subshell is filled first?

Verified Answer & Explanation⌄

Correct Answer: C) 5s

Concept Explanation

Using the (n + ℓ) rule: 5s: 5 + 0 = 5 4d: 4 + 2 = 6 5p: 5 + 1 = 6 Therefore, 5s has the lowest energy and fills first.

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