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periodic table. n. 1. (Chemistry) a table of the elements, arranged in order of increasing atomic number, based on the periodic law. Elements having similar chemical properties and electronic structures appear in vertical columns (groups). (ËpÉªÉr iËÉd Éªk, ËpÉªÉr-).
The periodic table of the elements The periodic table is an arrangment of the chemical elements ordered by atomic number so that periodic properties of the elements (chemical periodicity) are made clear.