Question

______ are the smallest unit of matter that can take part in a chemical reaction.

• A. Molecules
• B. Compounds
• C. Atoms
• D. Electrons

Answer 1

Answer: (C)

Atoms

Dalton's atomic theory states that atoms are the smallest unit of matter that can participate in a chemical reaction. Chemical reactions involve the combination, separation, or rearrangement of atoms, but atoms are neither created, destroyed, divided into parts, or converted into atoms of any other kind.

Option $C$ is correct.