What is the only subatomic particle that is directly involved in chemical reactions between atoms?

Which statement best describes the flow of energy in this scenario

An atom's configuration based on its number of electrons ends at 3p4. another atom has seven more electrons. starting at 3p, what is the remaining configuration? 3p63d34s2 3p43d54s2 3p64s23d3 3p44s23d

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit