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Jt00
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For example, consider a transition of an electron from the 3p to the 1s shell. You know Δl = 1 because of the change from a p shell to an s shell, but I was taught that ml = -l, -l + 1, ..., l. However, to be an allowed transition, Δml must be equal to zero. If ml is a set of numbers, how do you know it's equal to zero so a transition can be allowed?