The nucleus of most atoms is composed of which of the following subatomic particles?

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

Answer: (D)

Verified step by step guidance

1. Recall the structure of an atom, which consists of a nucleus and an electron cloud surrounding it.
2. Understand that the nucleus contains subatomic particles that contribute most of the atom's mass.
3. Identify the subatomic particles: protons, neutrons, and electrons, and know their locations within the atom.
4. Recognize that protons and neutrons are located inside the nucleus, while electrons orbit around the nucleus.
5. Conclude that the nucleus is composed of protons and neutrons, not electrons.