atom - smallest part of an element which retains its properties, proton - mass = 1, charge = +1, found in nucleus, neutron - mass = 1, charge = 0, found in nucleus, electron - mass = 0, charge = -1, found orbiting the nucleus, electron arrangement - p6 data book - how many electrons in each layer, isotope - same number of protons, different number of neutrons, nuclide notation - shows atomic and mass numbers with the symbol, group - column of elements in the periodic table, atomic number - number of protons, mass number - number of protons PLUS neutrons, staircase line - starts under boron and separates metals and nonmetals, symbol - one or two letters for each elements e.g. Na,

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