Which of the following is considered a subatomic particle?

• A. Atom
• B. Element
• C. Molecule
• D. Proton

Answer: (D)

Verified step by step guidance

1. Understand the definition of subatomic particles: these are particles smaller than an atom that make up the atom itself.
2. Recall the three main types of subatomic particles: protons, neutrons, and electrons.
3. Recognize that an atom is composed of subatomic particles but is not itself a subatomic particle.
4. Identify that an element is a pure substance made of one type of atom, and a molecule is a group of atoms bonded together; neither are subatomic particles.
5. Conclude that among the options given, the proton is a subatomic particle because it is a fundamental constituent of the atomic nucleus.