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periodic law

periodic law, statement of a periodic recurrence of chemical and physical properties of the elements when the elements are arranged in order of increasing atomic number. Such an arrangement in the form of a table in which the groupings of elements having similar properties are easily identified is called the periodic system or the periodic table.

Sections in this article:

Introduction
Pioneering Periodic Arrangements of the Elements
Introduction of Atomic Numbers

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved.

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