What are the variables of boyle's law?

pressure and number of molecules of gas
volume and temperature
pressure and temperature
volume and number of molecules of gas
pressure and volume

Boyles law is P1V1=P2V2,
P is pressure
V is volume
so it's pressure and volume

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.

Ibelieve the answer is d. titaniumhope my answer has you : )