Here's why:

* Element: A pure substance that cannot be broken down into simpler substances by chemical means. Sulfur is found on the periodic table and exists in its purest form as a single type of atom.

* Compound: A substance formed when two or more elements are chemically combined in a fixed ratio. For example, water (H₂O) is a compound made of hydrogen and oxygen.

* Mixture: A combination of two or more substances where each substance retains its own properties. For example, sand and water make a mixture.

Let me know if you have any other questions!