Select all the correct answers. Based on the reactivities of the elements involved, which reactions will form products that are more stable than the reactants?

Idon’t know sorry i don’t know the answer i’m s sorry

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.