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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-).
An example of a group in the periodic table is the alkali metal [alkali metals: The alkali metals are the elements in Group 1 of the periodic table. They have one electron in the outer shell.] group. This video clip shows some of the reactions that occur with this group.