| Element | Compound | Mixture | |
| It is made of two or more different kinds of atoms. | |||
| It is made of one kind of atom. | |||
| It is made of two or more different kinds of substances. | |||
| It is a pure substance. | |||
| It is not chemically combined. | |||
| Each part of it keeps its own chemical identity. | |||
| It can only be separated chemically. | |||
| It is represented by chemical symbols. | |||
| It is represented by chemical formulas. | |||
| It has a specific ratio of elements. |