What are some differences between boiling & evaporation?

Boiling happens much faster! Boiling also takes place at the bottom of the fluid whereas evaporation takes place at the top.

Hope this helps!

Evaporation can happen at any temperature while boiling takes place at or above the boiling point.

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.