Which particles within an atom are found in the nucleus and contribute to the atomic mass?

Which particles within an atom are found in the nucleus and contribute to the atomic mass?

• A. Electrons
• B. Quarks
• C. Protons and neutrons
• D. Neutrons and electrons

Answer: (C)

The particles within an atom that are found in the nucleus and contribute to the atomic mass are protons and neutrons. Protons carry a positive charge, while neutrons are electrically neutral. Together, they account for the majority of an atom's mass because electrons, which are found in the surrounding electron cloud, have significantly less mass compared to protons and neutrons. Protons determine the atomic number of an element and thus define the element itself, while neutrons contribute to the mass number and can influence the stability of the nucleus. The combination of protons and neutrons, therefore, dictates the overall mass of the atom, making this answer correct. This fundamental understanding of atomic structure is critical in fields such as chemistry and physics.

The particles within an atom that are found in the nucleus and contribute to the atomic mass are protons and neutrons. Protons carry a positive charge, while neutrons are electrically neutral. Together, they account for the majority of an atom's mass because electrons, which are found in the surrounding electron cloud, have significantly less mass compared to protons and neutrons.

Protons determine the atomic number of an element and thus define the element itself, while neutrons contribute to the mass number and can influence the stability of the nucleus. The combination of protons and neutrons, therefore, dictates the overall mass of the atom, making this answer correct. This fundamental understanding of atomic structure is critical in fields such as chemistry and physics.