What is the scientific definition of the word bay?

A. 17 hope this dudet

D.na is the answer hope this

Wyyeurudydudyeye2y3y3y3ueuudisusuisus7w7uwh2u

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.