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The rows are called periods. The atomic number of an element is the number of protons in the nucleus of an atom of that element. Periodic Table Of The Elements Learning Chart 17 X 22 The periodic table is a tabular arrangement of the chemical elements. The periodic table of elements . Metals reside on the left side of the table while non metals reside on the right. The periodic table also known as the periodic table of elements is a tabular display of the chemical elements which are arranged by atomic number electron configuration and recurring chemical properties. There are only 18 groups in the periodic table that constitute the columns of the table. It is organized in order of increasing atomic number. The structure of the table shows periodic trends. The periodic table is a tabular array of the chemical elements organized by atomic number from the element with the lowest atomic number hydrogen to the element with the highest atomic number oganesson. Lanthanoid