1. The problem statement, all variables and given/known data Draw an energy level diagram for hydrogen (use the vertical direction for energy and separate the states horizontally by angular momentum l) 2. Relevant equations I've got some fundamental misunderstandings with this one. I thought the energy levels of hydrogen were given by En = -R/n2 where R is the Rydberg constant. So that makes me think that E is not a function of its quantum number l But then I read that l is "the amount of orbital angular momentum of the electron". How can the electron have more or less angular momentum and this not affect the energy of the hydrogen system? I'd appreciate any insight.