atom - the smallest piece of an element that retains all the properties of that element, element - Type of matter made of only one kind of atom, proton - positively charged, found in the nucleus, neutron - no charge, found in the nucleus, electron - Negatively charged, NOT found in the nucleus, nucleus - Composed of protons and neutrons, atomic number - The number of protons in the nucleus, atomic mass - Protons + neutrons, How to find the number of neutrons in an atom - Atomic mass - atomic number, Mixture - An impure substance made of various atoms or molecules, Compound - A pure substance made of one type of molecule with a chemical formula, Molecule - Two or more atoms bound together, Part of the atom that gives it its identity - Proton, Part of the atom that determines what it reacts to - Electron, Part of the atom that give it stability - Neutron,

Atoms and Molecules Vocab

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