1. The problem statement, all variables and given/known data Hi, I've been given a problem set and there is suddenly new notation that I've never seen. Can anyone shed any light on what this means: "Treating a0 as a parameter, write down the complete wavefunctions (including radial and angular parts) for the states 1s, 2s, and 2p (giving all three ml possibilities in the last case)." 2. Relevant equations 3. The attempt at a solution I have no idea what the 1s, 2s and 2p mean. ml are the eigenvalues of the Lz operator, so I'm guessing 2p somehow corresponds to a state with l=1, as it says there are 3 m values, but other than that I don't know. Help!