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...Ps periodicity the periodic table presents a pattern of chemical and physical properties elements based on element s location these are electronic structure atoms nuclear charge ts history with provides basis for explain how first organized by mass to predict existence unknown mendeleev describe modern law was developed using atomic number moseley arrangement contains groups that share common structures classified as metals nonmetals metalloids their position identify periods families name electron key ideas valence shell electrons lewis dot following trends in can be inferred from effect shielding core radius ionization energy idea successive energies electronegativity ion affinity reactivity such size configuration placement use compare contrast specific locations effective zeff transition noble gases acid base oxides...