proton - define element; contribute to atomic mass; positive charge, neutron - contribute to atomic mass; help stabilize nucleus; neutral charge, electron - orbit nucleus; determine atom's chemical behavior by interacting with other atoms; negative charge, atomic number - number of protons in nucleus; determines elements identity and position on period table, atomic mass - determined by number of protons and neutrons in nucleus; total mass of atom; electrons don't add much to it, rows - called periods; indicate energy levels (electron shells), columns - called groups/family names; indicate number of valance electrons in element,

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