Answer
Please see the work below.
Work Step by Step
The required elements are in group IIA and period 4 and 5. Hence, the elements are Calcium and Strontium (Sr).
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 330: 8.34
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