Which manometer fluid would you use, and why? (b) briefly describe how the system would work if the manometer were simply filled with toluene. give several advantages of using the fluid you chose in part (a) over using toluene. (c) what is the purpose of the nitrogen blanket?

What? i don’t understand

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.

Sorry i dont understand the question can you rephase it?