why is neutrons heavier than electrons?
(wag nyo po sagotin ito: Because protons and neutrons are so much more massive than electrons, almost all of the mass of any atom comes from the nucleus, which contains all of the neutrons and protons. Table 4.4. 1 gives the properties and locations of electrons, protons, and neutrons.)
Because of the mass of energy that neutrons had, most of all atoms are formed by nucleus that contains all of the protons and neutrons. That's why neutrons are heavier than electrons and also protons.