Design techniques and materials that reduce the negative environmental impact of a structure are referred to as
A. green design
B. engineering technologies
c. modern safety devices
D. composite materials

Where is the graph ?

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.

Iimpact me by the one the yet but him.