How many ml of 2.00 M NaOH is needed to neutralize 45 ml of 3.25 M HBr? ​Please do not send links, I just want a simple step-by-step answer.​

C: plants and animals

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.