Question

which of the following subatomic particles gives the nucleus of an atom its mass?
neutrons only
electrons only
protons only
both protons and neutrons

Explanation:

The nucleus of an atom contains protons and neutrons. Protons have a positive charge and neutrons are neutral. Electrons orbit the nucleus and have negligible mass compared to protons and neutrons. The mass of the nucleus is mainly due to protons and neutrons.

Answer:

D. both protons and neutrons