General Chemistry 10th Edition

Published by Cengage Learning
ISBN 10: 1-28505-137-8
ISBN 13: 978-1-28505-137-6

Chapter 8 - Electron Configurations and Periodicity - Questions and Problems - Page 333: 8.106


Please see the work below.

Work Step by Step

We know that hydrogen is the smallest atom. Al of the other atoms are in the fourth period. We also that the trend in atomic radius is to increase form right to left in a period. Hence, Potassium K is in group IA.
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