Image from Science done wright.
So, in summary:
- element - a basic substance that can't be simplified (hydrogen, oxygen, gold, etc...)
- atom - the smallest amount of an element
- molecule - two or more atoms that are chemically joined together (H2, O2, H2O, etc...)
- compound - a molecule that contains more than one element (H2O, C6H12O6, etc...)
- When you mix different substances (elements or compounds) you've got a mixture.
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