what is the rate of a reaction if the value of K is 0.1, (A) is 1 M, and (B) is 2 M? Rate = k(A)^2(B)^2 A. 0.2 (mol/L)/s B. 1.6 (mol/L)/s C. 0.8 (mol/L)/s D. 0.4 (mol/L)/s

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.