The energies of orbital in a multi-electron depend on the quantum number(s) :
designates the overall shape of the orbital within a shell
affects orbital energies (larger = higher energy)
all electrons in an atom with the same value of are said to belong to the same sublevels
only integer values between 0 and n-1 are allowed
sometimes called the orbital angular momentum quantum number
spectroscopists use the following notation for sublevels