Answer
Cl is below F in the same group, and therefore has a lower energy. Cl is to the right of S and has a higher ionization energy.
Work Step by Step
Ionization energy increases from left to right, and from bottom to top.
Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition)
by Timberlake, Karen C.
Published by
Prentice Hall
ISBN 10:
0321908449
ISBN 13:
978-0-32190-844-5
Chapter 4 - Section 4.7 - Trends in Periodic Properties - Additional Questions and Problems - Page 131: 4.102
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