Explanation:
It is known that an atom consists of three sub-atomic particles which are protons, neutrons and electrons.
Inside the nucleus of an atom, there will be only protons and neutrons. Whereas electrons revolve around the nucleus of an atom.
Protons have a positive charge, neutrons have no charge and electrons have a negative charge.
Since, electrons are moving outside the nucleus hence, they tend to participate more easily in a chemical reaction. This is because there is less force of attraction between the nucleus and valence electrons due to which they react according to their reactivity.
Whereas very high energy is required to disturb the nucleus of an atom. Hence, it is not easy for the proton and neutron to participate in a chemical reaction.
Therefore, valence electrons is the part of an atom that determines how it will react with other atoms.
