Natural Science CLEP Prep Practice Exam

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Prepare for the CLEP Natural Science Exam with our comprehensive study materials and practice questions. Test your knowledge and ace the exam by mastering key concepts.

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What is the smallest unit of matter?

Atom
Molecule
Ion
Electron

The correct answer is: Electron

Electrons are the smallest unit of matter because they are subatomic particles and are not made up of smaller particles. Atoms are made up of protons, neutrons, and electrons, which are all further divided into smaller particles. Molecules are made up of atoms bonded together and are also not the smallest unit of matter. Ions are atoms or molecules that have gained or lost electrons, thus they still consist of multiple particles and are not the smallest. Therefore, the correct answer is D, electrons.