i just wanna cry cause i knew i should’ve payed attention in class but can some please help me with two of these questions for brainlest answer? :))

I think it would be 6.6x10^17

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.