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Atomic Structure Aufbau Principle and Orbital Energy

1

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The correct order of increasing orbital energy is:

Verified Answer & Explanation⌄

Correct Answer: C) 4s < 3d < 4p

Concept Explanation

Using the (n + ℓ) rule: 4s: 4 + 0 = 4 3d: 3 + 2 = 5 4p: 4 + 1 = 5 For equal (n + ℓ), lower n has lower energy. Therefore: 4s < 3d < 4p.

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