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Element.

a pure substance cannot be broken down into simpler substances by chemical means.

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Answer:

  • A pure substance that contains more than one atom is called a compound.

Explanation:

  • Compounds are formed by combination of atoms by a fixed ratio. They have their own characteristic features.
  • Pure substances are further broken down into elements and compounds. A compound can be destroyed by chemical means. It might be broken down into simpler compounds, into its elements or a combination of the two.

Example

  • H2SO4 which  is formed by combination of three different atoms like H, S and O.

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