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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. The structure of the table shows periodic trends, which provide insight into element behavior. The table is divided into periods (horizontal rows) and groups (vertical columns). Each element is represented by its chemical symbol, atomic number, and atomic mass. The periodic table is a fundamental tool in chemistry, providing a systematic way to organize and understand the properties of elements. It was first developed by Dmitri Mendeleev in 1869, who arranged the elements based on their atomic masses and chemical properties. Over time, the table has been refined and expanded as new elements were discovered. The periodic table is widely used in education, research, and industry, serving as a cornerstone of modern chemistry.