Final answer:
Matter is made up of tiny particles called atoms. All matter is composed of extremely small particles called atoms, and atoms of different elements differ in size, mass, and other properties.
Step-by-step explanation:
Matter is made up of tiny particles called atoms.
All matter is composed of extremely small particles called atoms. Atoms of a given element are identical in size, mass, and other properties. Atoms of different elements differ in size, mass, and other properties.