What type of air mass most likely located over atlanta and georgia

Answer is: continental tropical type of air mass most likely located over Atlanta and Georgia.
Atlanta and Georgia have a humid subtropical climate (hot and humid summers, mild winters) with four distinct seasons and good precipitation year round.
Gulf of Mexico can bring warm air and there is cold air from Artic.

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.