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Name: ______________ Period: _____________ Periodic Table •Representing a system of classifying, or logically grouping, all of the known elements –Brought order to unrelated facts –Helped scientist predict the existence of unknown elements Dmitri Mendeleev •Discovered that elements had characteristics in common –Index Cards- wrote its characteristic and properties •Atomic mass, density, color –Included elements Valence # (bonding power) •How many e- the atom can lose or gain when bonding •Pattern appeared - 1234321 •Was based on atomic mass •Atomic mass – •Problems occurred because some elements had the wrong properties –Not in common with the ones around it Modern Periodic Table Henry Moseley –Determined atomic number –Atomic Number –Redesigned Periodic Table based upon atomic # –Periodic Law •States that the physical and chemical properties of the elements are Periodic functions of their atomic number Design of the Periodic Table •Groups - Families –Eight main Columns of elements –Elements within the same group or family have similar properties •1st is extremely active solids •Last are inactive gasses –Same number of Valence Electrons – •Periods –Seven Horizontal Rows –Not alike in properties –Two periods that are separated from the PT are the Rare Earth Metals •Not really separated •Element Key –Contain Important Facts •Atomic # •Atomic Mass •Symbol •Name
