General Chemistry 10th Edition

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

Chapter 21 - Chemistry of the Main-Group Elements - Questions and Problems - Page 928: 21.13

Answer

Please see the work below.

Work Step by Step

We know that Potassium is more reactive than lithium as metals become more reactive going down the group IA. This is due to potassium is much larger so its 4s electrons are lost more easily than 2s electron of lithium.
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