Which of the following accurately shows all the math steps required when “showing your work” is required in calculating speed?

We can’t you if you only tell us that you have to show us what the answers are

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.

The formula is (nh4)2co3