Elements , compounds and mixture
Elements – They are pure substances made of only one kind of atom. Example: Oxygen (O), Hydrogen (H), Gold (Au).
Compounds –They are made when two or more elements combine chemically. Example: Water (H₂O) = Hydrogen + Oxygen,Salt (NaCl) = Sodium + Chlorine.
Mixtures – They are made when two or more substances are mixed but not chemically joined. Example: Air (a mix of gases), Salad, Fruit juice.
Easy way to remember:
Element – Only one type.
Compound – Joined together.
Mixture – Just mixed, not joined.
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