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The Chemical Educator

ISSN: 1430-4171 (electronic version)

Table of Contents

Abstract Volume 6 Issue 6 (2001) pp 324-332

The Periodic Table: An Eight Period Table For The 21st Centrury

Gary Katz

Periodic Roundtable, Cabot, VT 05647
Received March 23, 2001. Accepted May 7, 2001

Published online: 16 November 2001

Abstract. Throughout most of the 20th century, an eight-period periodic table (also known as an electron-configuration table) was offered as an improvement over the ubiquitous seven-period format of wall charts and textbooks. The eight-period version has never achieved wide acceptance although it has significant advantages. Many observers have questioned the way helium is displayed in this format. Now, a reinterpretation of the relationship of the first-period elements to successive elements may help make the eight-period table an attractive choice for the 21st century.

Key Words:  In the Classroom; general chemistry; periodic table

(*) Corresponding author. (E-mail: prt@connriver.net)

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Issue date: December 7, 2001

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