Final answer:
The three particles that make up atoms are protons, neutrons, and electrons. Protons and neutrons form the nucleus and have significant mass, while electrons orbit around the nucleus with much less mass.
Step-by-step explanation:
Components of an Atom
The three particles that make up atoms are protons, neutrons, and electrons. Protons have a positive electric charge and are found in the nucleus of the atom. Neutrons are neutral and also reside in the nucleus. Electrons, which have a negative electric charge, orbit around the nucleus at high speeds.
An atom's proton and neutron collectively contribute to most of the atom's mass. The number of protons in the nucleus defines the type of element. Electrons have a much smaller mass compared to protons and neutrons, approximately 1/2000th of their mass. The correct answer that identifies the three subatomic particles is d. protons, neutrons, and electrons.