For each of the following atomic transitions, state whether

For each of the following atomic transitions, state whether the transition is allowed or forbidden, and if forbidden, what rule is being violated;
(a) 4p → 3p;
(b) 2p → 1s;
(c) 3d → 2d;
(d) 4d → 3s;
(e) 4s → 2p.



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