Atom, the smallest amount of matter, Chemical Propert, property of a substance that can only be seen in a chemical change, Density, how tightly the atoms of a substance are packed together, Element, a type of pure substance on the periodic table, Matter, the amount of "stuff" in an object, Phases of Matter, the different forms a substance can take, Solid, atoms are locked together and can't move, Liquid, atoms are loosely connected and can flow easily, Gas, atoms are very far apart and spread out everywhere, Mixture, combining two or more substances without a chemical reaction, Molecule, more than one atoms "glued" or bonded together, Periodic Table, a chart scientists use to find information about elements, Physical Property, property of a substance that can be seen without a chemical change

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