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...Periodic table the is a of chemical elements in which are arranged by order atomic number protons such way that properties periodicity made clear standard form includes groups periods group vertical column indicates valence electrons period horizontal row layers equal to an atom s nucleus determines element for example any contains exactly its silver mass or weight average atoms calculated using relative abundance isotopes naturally occurring it sum and neutrons everything term used describe with specific characteristics there about different chemists have figured out over our body up hydrogen h carbon c nitrogen oxygen phosphorus p calcium ca...