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The effective nuclear charge increases along the period, therefore it's harder to remove the last electron from later groups (Cl) than the earliest ones (Si).
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 7 The Structure of Atoms and Periodic Trends - Study Questions - Page 281e: 76
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