For the n = 3 electron shell, which of the following quantum numbers are valid? Check all that apply.

For n = 3, the angular momentum quantum number l can be 0, 1, or 2, so l = 0 is valid, while l = 3 and l = −1 are not. The magnetic quantum number m must be an integer from −l to +l; with l = 2, m = −2 and m = 2 are both allowed. No allowed l value permits m = 3.

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