Element, Gold, , All single atoms, , , An atom is the smallest unit, 2 or more of the same atom bonded together, Compound, , The smallest unit of a molecule, , 2 or more different atoms bonded together, NH4, , Carbon Dioxide, (Sample of a) Pure Substance, , , A sample of a substance made of one type of particle, Elements and Compounds, salt, (Sample of a) Mixture, A sample of a substance made of 2 or more different types of particles, , , Air, fruit salad.

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