1. The problem statement, all variables and given/known data Explain why the 2p state for Lithium is close to the n=2 state for Hydrogen and why the 2s state is much higher. (5.4eV) 3. The attempt at a solution I think that for 2p state (n=2, l=1) we can model (for some reason) the Lithium valence electron like the electron orbiting Hydrogen. My guess is that we cannot do this for the l=0 state (2s) but I am unsure why this is the case.