Which particles can be found in the nucleus of an atom?

The nucleus of an atom is the dense central core that contains protons and neutrons. Protons are positively charged particles, while neutrons have no charge. Together, they make up nearly all of the atom's mass. Electrons, on the other hand, are found in the electron cloud surrounding the nucleus and are much lighter than protons and neutrons. Atoms themselves are not particles found in the nucleus; rather, they are the overall entities made up of both the nucleus and the surrounding electrons. Thus, protons and neutrons are the correct particles found in the nucleus, making this option the accurate choice.