Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 7 - Periodic Properties of the Elements - Exercises - Page 294: 7.73c

Answer

First ionization energy of Br: -325 kJ/mol. First ionization energy of Cl: -349 kJ/mol. Hence ionization energy of Br is smaller.

Work Step by Step

This is due to the fact that the atomic radius of Br is larger compared to that of Cl, hence it has smaller ionization energy.
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