What is the net change that occurs during the fusion process in the Sun? Two helium nuclei come together to form a larger helium nucleus, two protons, and energy. Four hydrogen nuclei join to form a helium nucleus, two neutrinos, and energy. Six hydrogen nuclei and two electrons join to form a helium nucleus, two protons, two neutrinos, and energy. Two hydrogen nuclei come together to produce a helium nucleus and energy.