Here's why:

* Element: A pure substance consisting of only one type of atom. These are the building blocks of everything around us and are organized on the periodic table. Examples include:

* Oxygen (O)

* Carbon (C)

* Gold (Au)

* Compound: A substance made up of two or more different elements chemically combined in a fixed ratio. Examples include:

* Water (H₂O)

* Carbon dioxide (CO₂)

* Salt (NaCl)

* Mixture: A combination of two or more substances that are not chemically bonded. The substances in a mixture retain their individual properties. Examples include:

* Saltwater

* Air

* Sand and water

Let me know if you have more questions!