Which group of particles are typically found within the nucleus of an atom?

The nucleus of an atom is composed of protons and neutrons, which are collectively known as nucleons. Protons are positively charged particles, while neutrons carry no charge, making them neutral. This combination of protons and neutrons is essential for defining the atomic mass and stability of the atom. The number of protons in the nucleus determines the element's identity (its atomic number), and neutrons contribute to the overall mass and stability of the nucleus.

In contrast, electrons, which are negatively charged particles, are located in the electron cloud surrounding the nucleus and do not reside within the nucleus itself. Consequently, only protons and neutrons are the particles that make up the nucleus, validating why this combination is regarded as the correct answer in the context of atomic structure.