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## Main Question or Discussion Point

Why is it that in Grotrian diagram only the 4p->3s is not allowed, but the 4s->3p, 4p-> 3d and 4d-> 3p are allowed ? I'm following the rules of Δl=±1 and Δm=0,±1 and they give the same numbers. I also tried with Δj=0,±1 and still the same.

Grotrian Diagram for Hydrogen for n=[1,4];

https://commons.wikimedia.org/wiki/File:Grotrian_H.svg#/media/File:Grotrian_H.svg

Grotrian Diagram for Hydrogen for n=[1,4];

https://commons.wikimedia.org/wiki/File:Grotrian_H.svg#/media/File:Grotrian_H.svg