The substance that contains only one type of particle is an element.
The substance that contains only one type of particle is called an element. An element is a pure substance composed of atoms that have the same number of protons in their atomic nuclei. These atoms cannot be broken down into simpler substances by ordinary chemical processes. There are 118 known elements, each with its own unique set of properties and characteristics. Examples of elements include oxygen, hydrogen, carbon, and gold.
