Question

What is inside in nucleus other than proton and neutron?

Answer 1

A nucleus is the center of an atom, where the subatomic particles are. All atoms are made of three subatomic ("smaller than an atom") particles: neutrons, protons, and electrons. The neutrons and protons are in the nucleus, and they give an atom most of its mass, and positive charge. The electrons are negatively charged, and surround the nucleus to balance the charge, but there is a huge empty space between the nucleus and the electrons. The nucleus is so small compared to the volume that electrons take up over 99% of atoms are empty space, but somehow everything feels pretty solid! (electrons move around inside a large volume that we call the atom, but each electron is very small if you treat it like a particle. You'll learn later you can treat it like a wave, but don't worry about that yet.)

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Answer 2

What is inside the nucleus? Mainly nucleons which are in turn neutrons and protons. But what holds them together is the strong nuclear force whose "gauge bosons" are pions, so those have at least momentary, 'virtual' existence as they are exchanged from one nucleon to another.

What you will NOT find in the nucleus are 1) electrons and 2) photons, except as they leave due to being generated there by some reaction.

Above all, do not make the mistake of thinking that a neutron is "made up of" an electron and a proton. It is not. The only reason the two (proton/neutron) appear after beta decay is that they are produced by the nuclear reaction itself, as is the (anti)neutrino also characeristic of beta decay.

Hope this helps you