What is the SUM of the coefficients for the balanced chemical equation below?

PLEASE

9

To balance the equation, there must be an equal number of Xs and Ys on each side. Since on the left side there are 2 Ys, and on the right side there are 3, you must put a coefficient of 3 on the left and 2 on the right to get the least common multiple of 6. Since putting 2 as the coefficient on the product makes a total of 4 Xs on the right, you must have a coefficient of 4 on the X product.

Thus, 4 + 3 + 2 = 9.

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.