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As you move from the light elements to the heavy elements you keep periodically coming across the same properties, which is why its called the Periodic Table. The recurring properties are organised so that you can easily see similarities between elements. The Periodic table is arranged in PERIODS and GROUPS, going from the light elements at the top, to the heavy elements at the bottom. The rows going ACROSS from left to right are PERIODS. Elements in the same period all share something in common. They have the same number of energy shells. Each new period row represents a new shell. Elements in the first period have one shell, and as we go down, the shells increase. Hydrogen is in the first period. It has one shell. Potassium is in the 4th period, and has four energy shells, as do all the other elements in this period. The columns going down from top to bottom, are the GROUPS. Elements in the same group also have something in common. Elements in the same group have the same number of
