atom - basic unit of matter, protons - positively charged subatomic particles, electron - Negatively charged subatomic particles, neutron - Neutrally charged subatomic particle, nucleus - protons and neutrons found here, electron cloud - outside of the nucleus, matter - has mass and takes up space, compound - two or more types of elements bonded together chemically, homogeneous mixture - solution, heterogeneous mixture - trail mix, raisin bran, lucky charms, mixture - physically combined, pure substance - type of matter which exists in its most basic or purest form and cannot be broken down further physically,

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