The Origin of the Periodic TableThe Periodic Table was created bya Russian chemist named DmitriMendeleev.It was created 1869.Others before Mendeleev hadorganized the elements butMendeleev was the creator of thetable.
How is the Table Organized?The table is organized in rows (orperiods) and columns (or groups/families).The periods are the horizontalrows.The groups are the verticalcolumns.
Element RelationshipElements that are in the same period have the samenumber of atomic orbital.The elements that are in that are in the same grouphave the same number of electrons in their outerorbital (valence electrons).
Element: Oxygen (O)Atomic Number - 8Atomic Mass - 15.99This element is used in everydaylife, it’s the air around us that weneed to live. It is a highlyreactive nonmetallic elementthat forms compounds. By mass,oxygen is the third mostabundant element in theuniverse.
Element: Copper (Cu)Atomic Number - 29Atomic Mass - 63.54You commonly see copperwhen using a penny. It has avery high electricalconductivity and is used as aconductor of heat andelectricity.
Element: Gold (Au)Atomic Number - 79Atomic Mass - 196.96Gold is seen in nice jewelry, it’sconsidered very attractive. It’sone of the least reactivechemical elements and hasbeen very valuable for years.Gold can resist attacks byindividual acids.