Answer
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.
Chemistry: The Molecular Science (5th Edition)
by Moore, John W.; Stanitski, Conrad L.
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
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