Protons - In the nucleus of an atom (positively charged), Neutrons - Small uncharged particles that are found in the nucleus of an atom., Electrons - Particles in an atom with a negative charge., Elements - Can not be broken down into any other simpler substance., Compounds - 2 or more elements chemically combined., Mixtures - A physical combination of substances that can be seperated., Heteogenous - Not similar; very different mixed together., Homogeneous - Of the same kind; uniform throughout, Pure Substance - A sample of matter, either a single element or a single compound, that has definite chemical and physical properties., Atomic number - The number of protons in the nucleus of an atom, Atomic mass - The average mass of all the isotopes of an elements number of protons and neutrons,

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