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A substance that can't be broken down into smaller pieces
Can combine to make compounds
Can mix to make mixtures
Atomic number is the number of protons in the nuclei of its atoms
They can either be found in their free state or in the form of their compounds
Iron, Uranium, Helium, Nitrogen, and Potassium are all elements

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A substance formed through chemical changes
The elements form very strong bonds
They require a lot of energy to break
The elements don't retain their original properties
The compound doesn't behave like the elements it's made of
Alcohol, Carbon Monoxide, Sulfate, Hydrogen peroxide, and Carbon dioxide are all compounds

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A material composed of 2 or more similar substances
A combo of 2 or more substances in any proportion
The substances don't combine chemically
Homogenous mixtures have the same composition throughout
Heterogenous mixtures vary in composition
Gas, Gunpowder, Cement, Gasoline, and Blood are all mixtures

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Atoms and molecules in Elements, Compounds, and Mixtures