consider an atom that has an electron in an excited state. the electron falls to a lower energy lever. what effect does that have on the electron?

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.

Answer explain why it is not possible to deduce a complete order of reactivity.

Which factor is likely to impact the possible number of compounds ?