According to the atomic theory of matter, what is true about atoms?

The atomic theory of matter posits that all matter is composed of extremely small particles known as atoms. This foundational principle asserts that every substance, whether solid, liquid, or gas, is made up of atoms, which are the basic building blocks of matter. Understanding this concept is crucial because it highlights the idea that the diverse array of materials in the universe can be explained by the unique arrangements and combinations of atoms. This underscores the significance of atoms in forming not only elements but also compounds and complex structures, which are essential in understanding chemistry and materials science.