• For the n = 4 shell, l = 0, 1, 2 and 3. These are labelled as '4s', '4p, '4d' and '4f' subshells respectively.
  • For the l = 0 subshell, ml = 0 only. This is the 4s orbital:
  • For the l = 1 subshell, ml = -1, 0, +1. There are three 4p orbitals:.
  • For the l = 2 subshell, ml = -2, -1, 0, +1 and +2. There are five 4d orbitals:.
  • For the l = 3 subshell, ml = -3, -2, -1, 0, +1, +2 and +3. There are seven 4f orbitals:.