Answer
Please see the work below.
Work Step by Step
We know that the element is in group A, hence it is rubidium. The ground state electron configuration is $[Kr]5s^1$.
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 332: 8.93
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