10.2 liters of gas at 1.5 atm is compressed into a 1.65L cylinder. What is the pressure of the compressed gas if its temperature remain constant temperature remains constant?

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 answer is d.potassium

No because it not possibly