Which of the following particles are contained in the nucleus of an atom?

The nucleus of an atom is composed of protons and neutrons. Protons carry a positive charge, while neutrons are neutral, meaning they have no charge. Together, these particles constitute the core of the atom and account for most of its mass. The number of protons in the nucleus determines the element and its position in the periodic table, while neutrons contribute to the stability of the nucleus.

Electrons, on the other hand, are negatively charged particles found outside the nucleus in the electron cloud, and they do not reside within the nucleus itself. Therefore, the correct identification of the particles contained in the nucleus is specifically protons and neutrons.