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Element -
Element is the simplest pure substances in which all the atoms are exactly the same. It can be classified into metals, non-metals and metalloids.
Example - Hydrogen, Carbon, Oxygen
Compounds -
It is a combination of two or more elements. It is a pure substance.
Example - Water, Carbon dioxide
Mixtures -
A mixture consists of two or more substances which are not combined chemically. The substances combined in a mixture are in any ratio. Examples: sand and salt, flour and husk.