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The classification of elements in periodic form is a great achievement in the history of chemistry. It is difficult to study individually the chemistry of more than one hundred natural or synthetic elements and millions of their compounds. The periodic table provides systematic and organized chemical behavior of the elements into few simple and logical patterns. In periodic table elements are arranged in rows & columns. From the position of the element, it is possible to predict its chemistry. In this unit, we will study the historical development of modern periodic table, its function and some of the periodic trends in the physical and chemical properties of the elements.