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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 classic Periodic Table organizes the chemical elements according to the number of protons that each has in its atomic nucleus. Credit: Karl Tate, Livescience.com contributor. The Periodic Table of the Elements arranges all of the known elements in an informative array.