Imagine a world in which all the elements existed, but they couldn’t form any chemical bonds with each other. what kinds of substances could exist in such a world? what kinds of substances could not exist? what do you think this world would be like?

Particle exchange energy though elastic collision , hope this .

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.