* Matter is made of atoms. Atoms are the smallest unit of an element that retains the chemical properties of that element. They're incredibly small, about 100,000 times smaller than the width of a human hair!
* Atoms are not directly visible. We can't see them with our naked eyes or even with most microscopes. We know they exist because of their effects on the world around us, and we can study them with sophisticated tools like electron microscopes.
* Atoms have parts that are even smaller. Atoms are made up of protons, neutrons, and electrons. These particles are even smaller than atoms and are also not directly visible.
So, to answer your question more precisely:
* Matter is made up of parts that are too small to see directly.
* The "visible parts" of matter are actually the effects of atoms interacting with light. We see the color of an object because it absorbs some wavelengths of light and reflects others. We see the shape of an object because light bounces off its surface and enters our eyes.
Let me know if you have any other questions about the structure of matter!
