Identify the last electron added in the energy diagram
Determine the orbital type for that electron from the diagram
Assign the principal quantum number n from the shell level
Assign the azimuthal quantum number l from the subshell
Determine the magnetic quantum number m_l from the specific orbital box
Determine the spin quantum number m_s from the arrow direction
Use m_s = +1/2 for an upward arrow
Use m_s = -1/2 for a downward arrow