Whats a difference between elements,compound and mixture?

Question

I'm just studying for test and I hope someone can help me with this question please and thank you.

Answer 1

An element is when all of the atoms are made of a single substance. (Example: iron.)

Compounds are a combination of two or more elements integrated with each other. (Example: Iron and carbon can make steel.)

Mixtures are when the substances are mixed together, but the substances maintain their own composition. (Example: air is made of oxygen, nitrogen, carbon dioxide, etc., but each particle is its own thing.)