A scientist submerged a sealed plastic syringe filled with 50mL of room temperature air into a beaker of boiling water and recorded the change in volume of the gas as it heated up. Which of the following graphs best represents the data the scientist gathered?

I’m not sure what your trying to say here.. can you clarify again?

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.