* Compounds are formed by the chemical combination of two or more different elements. This means a compound always involves atoms of at least two different types.
* Purification separates a compound from other substances, but it doesn't change the compound's chemical composition. So, a purified compound will still have the same elements in the same proportions as the original, unpurified compound.
Example:
* Water (H₂O) is a purified compound. It consists of two hydrogen atoms (H) and one oxygen atom (O).
* Sugar (C₁₂H₂₂O₁₁) is another example. It's a compound made up of carbon (C), hydrogen (H), and oxygen (O) atoms.
In contrast, a pure element contains only one type of atom. For example, gold (Au) is a pure element and consists only of gold atoms.
