What is the scientific method? A. A set of rules that all scientists need to follow
B. A way for scientists to prove that their theories are correct
C. A set of steps that help scientists gather knowledge
O D. A way for scientists to come up with questions about the world
SUBMIT

Cis the

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.