What are the units of matter that cannot be further broken down by chemical means?

Question

Quizplus · Accepted Answer

Atoms are the smallest units of matter that cannot be further broken down by chemical means. Organic compounds can be broken down into smaller molecules, cells are composed of various molecules and can be broken down into smaller components, and solvents are substances that dissolve other substances but are not made up of unique units of matter.

What Are the Units of Matter That Cannot Be Further