Answer:
Matter is matter. Particles are particles. Atoms are atoms. You can explain matter using particles and atoms.
JK!
Real Answer:
The term matter refers to anything that occupies space and has mass—in other words, the “stuff” that the universe is made of. An atom is the smallest unit of matter that retains all of the chemical properties of an element. Most atoms contain all three of these types of subatomic particles—protons, electrons, and neutrons.
Hope this helps!