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Atomic Structure Aufbau Principle and n + ℓ Rule

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The subshells 4f, 5d, 6p and 7s all have the same (n + ℓ) value. Which is filled first?

Verified Answer & Explanation⌄

Correct Answer: A) 4f

Concept Explanation

For all four subshells: n + ℓ = 7 When (n + ℓ) values are equal, the subshell with the lower n value is filled first. Therefore, 4f is filled first.

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