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The periodic table is a tabular arrangement of all known chemical elements, organized by their atomic structure and properties.
The periodic table is read from left to right and top to bottom. The elements are arranged in rows and columns based on their atomic number, electron configuration, and chemical properties.
The numbers on the periodic table represent the atomic number, which is the number of protons in the nucleus of an atom. The letters represent the element's symbol, which is usually the first letter or two of its name.
As of 2021, there are 118 elements on the periodic table. However, new elements may be added in the future as they are discovered.
The periodic table is used in science to predict the properties and behavior of elements, understand chemical reactions, and develop new materials and compounds. It is also used to classify and organize the elements in a logical manner.