Bromine reacts with aluminum to produce aluminum bromide, AlBr3(s). Predict the product of the reaction between fluorine and aluminum and write a
balanced chemical equation for the reaction.

Is there a diagram/picture you can provide? it seems this question goes along with a

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.