Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning
ISBN 10: 1285199049
ISBN 13: 978-1-28519-904-7

Chapter 5 - Electron Configurations and the Periodic Table - Questions for Review and Thought - Topical Questions - Page 240d: 100c


H, He, Li, Be

Work Step by Step

We know that elements with atomic numbers 1-4 have only s electrons. Because of this, the atomic number gives the number of s electrons for the first 4 elements. Thus, the answer is: H, He, Li, Be.
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