The rows of the table are called periods, and the columns are called groups. The table is divided into four roughly rectangular areas called blocks. It is a graphic formulation of the periodic law, which states that the properties of the chemical elements exhibit an approximate periodic dependence on their atomic numbers. It is widely used in chemistry, physics, and other sciences, and is generally seen as an icon of chemistry. The periodic table, also known as the periodic table of the ( chemical) elements, is a rows and columns arrangement of the chemical elements.
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