The nucleus of an atom consists mainly ofa) neutrons and electronsb) protons and electronsc) protons and neutronsd) protons, neutrons, and electronse) none of the above

Protons and neutrons

Explanation:

The nucleus is the most massive part of an atom. It is made up of neutrons and protons. Protons are positively charged while the neutrons have no charge. Both the proton and neutrons are known as nucleons because they are found in the nucleus.

The mass of an atom is concentrated in the nucleus due to the masses of the nucleons compared to the electrons in the orbitals. Electrons occupies more atomic space compared to the nucleons.