You are playing a game “will it float?” In this game, you are given a large, square can of tuna. If you know the density of water, what is the minimal information you need to decide if the tuna will float in the water?

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.

Bis the answerhope it !