Periodic Table - Element arrangement chart, Families - Element groups, Metals - Conductive elements, Nonmetals - Poor conductors, Noble Gases - Inert elements, Metalloids - Semi-conductors, Mass Number - Protons and neutrons, Atomic Number - Proton count, Symbols - Element abbreviations, Alkali Metals - Group 1 elements, Alkaline Earth Metals - Group 2 elements, Halogens - Reactive nonmetals, Transition Metals - D-block elements, Lanthanides - Rare earth metals, Actinides - Radioactive elements, Valence Electrons - Outer shell electrons, Electron Configuration - Electron arrangement, Periods - Horizontal rows, Dmitri Mendeleev - Periodic table creator, Chemical Properties - Reactivity characteristics,

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