Yes, that's correct! Atoms and their combinations make up all the substances in the world, including everything you can see, touch, and smell, as well as things you can't, like air and light. Here's why:

* Atoms are the building blocks: Atoms are the smallest unit of an element that still retains the chemical properties of that element. Think of them as tiny Lego bricks.

* Combining atoms: Atoms can bond together to form molecules. Molecules are groups of two or more atoms held together by chemical bonds. Imagine these Lego bricks snapping together to create more complex structures.

* Elements and compounds: A pure substance made up of only one type of atom is called an element (like gold or oxygen). Substances made up of two or more different types of atoms are called compounds (like water or salt).

* Everything is made of atoms: From the smallest speck of dust to the largest star, everything is made up of atoms or combinations of atoms.

It's important to note that:

* There are some things that aren't made of atoms: Things like light, heat, and sound are forms of energy, not matter. Energy doesn't have the same building block structure as matter.

* There's still much to learn: While we know a lot about atoms, there are still many mysteries about how they work and how they interact to form the universe we experience.

So, in essence, atoms are the fundamental building blocks of everything we know!