Which of the following accurately reflects the composition of an atomic nucleus?

The composition of an atomic nucleus is accurately reflected by the presence of protons and neutrons. Protons, which carry a positive charge, and neutrons, which have no charge, are both located in the nucleus of an atom. This area is the dense central core of an atom where the mass is concentrated. Electrons, on the other hand, exist outside the nucleus in various energy levels or shells and do not contribute to the nucleus's composition. Therefore, the statement that the atomic nucleus consists of protons and neutrons correctly represents the structure of matter at the atomic level.