Atom, The smallest partical that can exist on it's own, Element, A substance made up of 1 type of atom, Molecule, 2 or more atoms chemically joined, Compound, Contains 2 or more types of atom chemically joined, Periodic table, A list of elements., Nucleus, The centre of an atom that contains protons and neutrons, Mixture, Two or more substances that can be easily separated by physical methods., Substance, A form of matter that has a constant composition and properties that are constant throughout the sample., Elements, Represented by Symbols, Water, Contains two hydrogen atoms and one oxygen atom and is the most abundant compound on earth., Oxygen, Has an atomic number of 8 and it helps organisms grow, reproduce, and turn food into energy., Compound, Can have covalent bonds, ionic bonds, or metallic bonds in fixed ratio.

ELEMENTS AND COMPOUNDS CHARACTERISTICS

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