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 - Additional Exercises - Page 294: 7.83b

Answer

The bond distance increases because the atomic radii increases as you move down in the periodic table.

Work Step by Step

As you move from top to bottom in the periodic table the number of electrons increases. This means the number of electron shells increase, which in turn increases the atomic radii. The bond distance is a function of the atomic radii, so as the atomic radii increases the bond distance increases.
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