Elements: Made of only one kind of atom, Cannot be broken down into a simpler type of matter, Nitrogen, Ozone, Magnesium, Sulfur, Silicon, Carbon, Compounds: Atoms of 2 or more elements bonded together, Made of molecules that contain more than one kind of atom, Can be broken down into elements by a chemical reaction, Always has the same ratio of elements, Has different properties from the elements that make it up, Water, Rubies, Table Salt, Mixtures: Made of more than one element or compound mixed together, but not bonded, Can be separated into components by physical means, Often retains the properties of its components, Air, Granite, Salad Dressing, The Catch-All Drawer in the Kitchen,

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