1) basic building blocks of matter 2) Substances that cannot be broken down chemically into simpler kinds of matter 3) Positive charge 4) neutral in charge found in nucleus 5) Negative charge (not in nucleus) 6) The center of the atom that contains the neutrons and protons 7) organizes the elements in a particular way. 8) Refers to how many protons an atom of that element has 9) It is found by adding the number of protons and the number of neutrons 10) columns of the table 11) Characteristics of elements (grouped together based on of how they look and behave) 12) good conductors of heat and electricity 13) poor conductors of heat and electricity (usually gases) 14) extremely unreactive (Family 18) 15) a material formed by chemically bonding two or more chemical elements. 16) a one- or two-letter abbreviation for a chemical element name

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