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Atomic Structure and Electron Configuration

AP Chemistry· difficulty 4/5

Which set of quantum numbers (n, ℓ\ell, mℓm_\ell, msm_s) is NOT allowed?

  • A

    (3, 3, 0, +1/2)

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  • B

    (3, 0, 0, +1/2)

  • C

    (2, 1, +1, +1/2)

  • D

    (4, 2, −1-1, −1/2-1/2)

Explanation

ℓ\ell must satisfy 0≤ℓ≤n−10 \leq \ell \leq n-1. For n = 3, ℓ\ell can be 0, 1, or 2 — never 3. Other sets are valid.

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