Read the passage and answer the question.

Nucleus of an atom is central dense mass consisting of protons and neutrons. If an atom is enlarged to the size of a classroom, the nucleus would be the size of a pinhead. In other words, an atom is almost empty. The size of a nucleus is that as compared to that of an atom.

What can we say about nucleons, the constituents of nucleus?

neutrons and protons

Protons and neutrons together form the nucleus.