transition "3d -> 2p" can be allowed? 3d : n=3 , l=2 , ml = +1, +2, 0, -1, -2 2p : n=2, l=1, ml = +1, 0, -1   (Delta) l = +-1 (I know) But isn't (Delta) ml = +3, +2, +1, 0, -1, -2, -3? Is transition allowed? I'm not proper at using English

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