Which is a correct set of values of m for one of the subshells of n is equal to 2 ?

For n = 2, the allowed subshells have l = 0 or l = 1. The magnetic quantum number m can be any integer from −l to +l, so the l = 1 subshell has m values −1, 0, and 1. This is choice B; the other listed sets include values that are not allowed for a subshell with n = 2.

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