2.)Which action forms a different chemical substance? A. crushing a rock
B. burning a piece of wood
C. mixing salt and pepper
D. melting an ice cube

During photosynthesis, plants transform electromagnet energy from the sun into chemical energy.

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.