(21) In the octant approach, each of the 8 electrons in the second and third shells are distributed in one octant. ↑ ↑
(22) The magnetic dipoles of the 8 electrons of the second as well as the third shell balance each other out. ↑ ↑
(23) For the description of the electron in the 2nd and 3rd shell, the octant position and the orientation of the magnetic dipole are sufficient. ↑ ↑