Element: found on periodic table, contain one type of atom, gold is an example, you have non metal and metal, they are the building blocks, Compound: contain different atoms joined together, have two words in name, iron sulphide is an example, made by a chemical reaction, difficult to separate, Mixture: can be easily separated, can contain compounds and elements, air is an example, filtering and chromatography, sea water is an example of this,

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