Which of the following lists includes all three main subatomic particles found in atoms?

• A. Protons, electrons, and photons
• B. Protons, neutrons, and alpha particles
• C. Neutrons, electrons, and positrons
• D. Protons, neutrons, and electrons

Answer: (D)

Verified step by step guidance

1. Recall that atoms are composed of three main subatomic particles: protons, neutrons, and electrons.
2. Understand the role of each particle: protons carry a positive charge, neutrons are neutral (no charge), and electrons carry a negative charge.
3. Identify that photons and alpha particles are not subatomic particles found inside atoms; photons are particles of light, and alpha particles are helium nuclei emitted in radioactive decay.
4. Recognize that positrons are the antimatter counterparts of electrons and are not typically found as part of a normal atom's structure.
5. Conclude that the list containing protons, neutrons, and electrons correctly includes all three main subatomic particles found in atoms.