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Atomic Structure STB Atomic Structure MCQs (STB)#Atomic Structure #Electronic Configuration

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According to the n + ℓ rule, which orbital is filled first?

Verified Answer & Explanation⌄

Correct Answer: B) 4s

Concept Explanation

For 4s, n + ℓ = 4; for 3d, n + ℓ = 5. The orbital with the lower n + ℓ value fills first, so 4s fills before 3d.

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