Answer
Please see the work below.
Work Step by Step
We know that Mendeleev arranged the elements on the basis of increasing atomic weight. His periodic table consisted of rows and columns and he left spaces for unknown elements at that time.
General Chemistry 10th Edition
by Ebbing, Darrell; Gammon, Steven D.
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 329: 8.10
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