- Element: An element is a pure substance and is made up of one kind of atoms. Example: Sulphur, Hydrogen, Oxygen.
- Compound: A compound is a pure substance made up of two or more different elements combined chemically in a fixed proportion. Example: Water.
- Mixture: A mixture is an impure substance made up of two or more elements or compounds mechanically mixed together in any proportion. Example: Gun-powder.
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