Explain how the periodic table is organized. Include the following in your response: What is the relationship between elements in the same group? How does an element's location on the periodic table relate to its reactivity? Describe the properties of the following families of elements: Hydrogen, Alkali Metals, Alkaline Earth Metals, Halogens, and Noble Gases.

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Periodic table

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WRITTEN BY

J.J. Lagowski See All Contributors

Professor of Chemistry, University of Texas at Austin. Author of The Chemical Bond.

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Alternative Title: periodic table of the elements

Study chemistry's periodic law to understand elements' properties and how they relate to one another

Study chemistry's periodic law to understand elements' properties and how they relate to one another

Explanation of the periodic table.

Encyclopædia Britannica, Inc.

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Periodic table, in full periodic table of the elements, in chemistry, the organized array of all the chemical elements in order of increasing atomic number—i.e., the total number of protons in the atomic nucleus. When the chemical elements are thus arranged, there is a recurring pattern called the “periodic law” in their properties, in which elements in the same column (group) have similar properties. The initial discovery, which was made by Dmitry I. Mendeleyev in the mid-19th century, has been of inestimable value in the development of chemistry.

periodic table

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