Which set of quantum numbers (n, l, m) is forbidden?

  1. A

    3, 2, 0

  2. B

    3, 1, -1

  3. C

    2, 0, 0

  4. D

    1, 1, 0

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    Solution:

    The set of quantum numbers (n, l, m) is forbidden are 1, 1, 0.

    The quantum number I must be smaller than n, which it is not, even if the quantum number n is an integer. This means that certain quantum numbers are not permitted. Although n, the fundamental quantum number, is an integer, l cannot be negative. Therefore, this set of quantum numbers is not permitted.

    Hence, the option D is correct.

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