Define element, compound, and mixture.

An element is a pure substance made up of only one type of atom. Examples include hydrogen, oxygen, and carbon. A compound consists of two or more elements chemically bonded in fixed proportions, such as water (H₂O) or carbon dioxide (CO₂). A mixture, on the other hand, contains two or more substances physically combined, and these substances retain their individual properties. Examples of mixtures are air, salad, or saltwater. Mixtures can be homogeneous (uniform composition) or heterogeneous (distinct components), unlike compounds, which have a uniform composition.

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