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Ion Atom with more or less electrons than normal Element Pure substance that can't be broken down Compound 2 or more elements chemically combined Mixture 2 or more substances not chemically combined but just put together. Isotope Atom with more or less neutrons than normal Heterogeneous Mixture that is unevenly mixed (like a salad) Homogeneous Mixture that is evenly mixed (like koolaide) atom smallest particle of matter Symbol Stands for an element such as "H" for hydrogen Formula Stands for a compound such as "H2O" for water Proton Positive part of atom - in nucleus, mass of 1amu Neutron Neutral part of atom - in nucleus, mass of 1 amu Electron Negative part of atom - located outside of nucleus, no mass Nucleus Center of atom - where protons and neutrons are. chemical change Change where something is completely different with new properties like burning Physical Change Change where it is still the same material only different - cutting, freezing etc.