Element is a mixture of two atoms
compound is a mixture of two elements
mixtures is a mixtures of two or more than two compunds
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An element is a pure substance     made up of one kind of atom which cannot be broken down into simpler substances by any means.

a compound is a pure substance comprising of two or more elements mixed in a fixed ratio.

mixture is an impure substance which comprises of more than one substances mixed physically in any ratio.

hope this helps and plz mark as best
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