The form of matter made of one type of atom is called an element.

Here's why:

* Elements are the simplest pure substances. They cannot be broken down into simpler substances by chemical means.

* Atoms are the fundamental building blocks of all matter.

* Each element is defined by the number of protons in its atoms. For example, all gold atoms have 79 protons, and all carbon atoms have 6 protons.

Examples of elements:

* Gold (Au)

* Carbon (C)

* Oxygen (O)

* Helium (He)

* Iron (Fe)

Let me know if you have any other questions!