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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-).
group noun (SET) A1 [ C ] a number of people or things that are put together or considered as a unit: I'm meeting a group of friends for dinner tonight. The car was parked near a small group of trees. She showed me another group of pictures, this time of children playing.