Answer
The highest occupied energy level in Chlorine is n = 3 with a configuration of $3s^{2}3p^{5}$.
The highest occupied energy level in Selenium is n = 4 with a configuration of $4s^{2}4p^{4}$
Work Step by Step
See above
Chemistry: The Molecular Science (5th Edition)
by Moore, John W.; Stanitski, Conrad L.
Published by
Cengage Learning
ISBN 10:
1285199049
ISBN 13:
978-1-28519-904-7
Chapter 5 - Electron Configurations and the Periodic Table - Exercise 5.15 - Highest Energy Electrons in Ground-State Atoms - Page 219: a
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