Mendaleev, The Russian scientists who developed an early Periodic Table in 1869., Atomic Mass, The elements of the first Periodic Table were arranged by their ____________., Atomic Number, The number on an Element's square on the Periodic Table indicated the number of protons in its atom. , Chemical symbol, The one- or two- letters that represent an element on the Periodic Table, Periodic, To be repeated in a pattern., Periods, The name for the seven rows that go across the Periodic Table., Groups, The name for the 18 columns that go down the Periodic Table., Properties, The elements are located in certain groups and families based on their ____., Metallic Luster, The property that means a certain shine that a metal has., Malleable, The property that means the substance can be easily flattened or shaped without breaking., Conductor, If heat and electricity run easily through a substance, then it is a good ____., Staircase, On either side of this feature of the Periodic Table are the metalloids., Metals, The elements that have luster, good conductivity, and malleability., Nonmetals, The elements located to the right of the staircase on the Periodic Table..

Periodic Table: Sum-it-Up

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