what can be added to an atom to cause a non - valence electron in the atom to temporarily become a valence…

what can be added to an atom to cause a non - valence electron in the atom to temporarily become a valence electron?\nenergy\nmass\nneutrons\nelectrons
Answer
Answer:
A. energy
Brief Explanations:
Adding energy can excite an electron to a higher - energy level, making a non - valence electron temporarily become a valence electron. Mass, neutrons, and adding electrons do not have this effect in the described context.