An element has a density of 57.8 mg/mm . what is the density of the element in dag/m3

The reaction will shift to the right

The answer is celsius 

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.