How many milliliters of a 0.420 M HCl solution are needed to neutralize 19.90 mL of a 0.175 M KOH solution

Which of the following did you identify correctly

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

Ok so co(g) is not pronoused that. the only clue is that youpronouse it the oppisote way.