Which of the following are the very small particles that make up matter?

• A. mass
• B. weight
• C. molecules
• D. atoms

Answer: (D)

Verified step by step guidance

1. Understand the question: It asks for the very small particles that make up matter.
2. Recall the basic structure of matter: Matter is composed of tiny particles called atoms, which are the fundamental building blocks.
3. Differentiate between the options: 'Mass' and 'weight' are properties of matter, not particles; 'molecules' are groups of atoms bonded together, but atoms themselves are the smallest units.
4. Conclude that atoms are the smallest particles that make up matter, as they combine to form molecules and everything else.
5. Therefore, the correct answer is 'atoms' because they are the fundamental particles constituting all matter.