Two electrons in two deuterons exchange their energies in fusing four protons in alpha 4 where every electron divides its 2.2 Mev energy between two protons one of them is in the other deuteron .Therefore the electron’s energy in neutron as a system and as a constant is that the nuclear binding energy and not the energy comes as a portion of mass turns out to be a pure energy from the two protons + two neutrons of alpha 4 according to Einstein’s famous equation E=mc^2 , at least, because in 2.2 Mev energy, the speed of light is exceeded by the electron in the nuclear range
