The total number of electrons in Cu²⁺ for which the summation of the azimuthal quantum number (l) and magnetic quantum number (m) is zero is:
Correct answer: D. 10 or 11
- A. 7 or 8
- B. 11 or 12
- C. 5 or 6
- D. 10 or 11
Explanation
Cu²⁺ electron configuration: [Ar] 3d⁹ We count electrons for which (l + m = 0): s-orbitals (l = 0, m = 0): 1s² + 2s² + 3s² → 6 electrons p-orbitals (l = 1, m = -1): 2p⁶ + 3p⁶ → 4 electrons d-orbitals (l = 2, m = -2):3d⁹ → 1 electron Total electrons with (l + m = 0) = 6 + 4 + 1 = 11
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