A solution of the Schrodinger wave equation for the hydrogen atom results in a set of functions (orbitals) that describe the behavior of the electron. Each function is characterized by 3 quantum numbers: n, l, and m_l. The quantum number l can have values from to. The total number of orbitals possible at the n = 4 energy level is. the quantum number m_l can have values from to. The total number of orbitals possible at the l = 3 sublevels is.