Natural Science CLEP Prep Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

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.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What is the smallest representative unit in chemistry?

Atom
Molecule
Ion
Proton

The correct answer is: Atom

Atoms are the smallest representative unit in chemistry, as they are the basic building blocks of matter. A molecule is made up of two or more atoms bonded together, so it is not the smallest unit. An ion is an atom or molecule that has gained or lost electrons, making it electrically charged, so it is also not the smallest unit. A proton is a subatomic particle found in the nucleus of an atom, but it is only one component of an atom and not the entire unit itself. Therefore, the correct answer is A Atom.