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 292: 7.43b


$Ca$ has smaller first ionization energy.

Work Step by Step

The periodic trend of the first ionization energy: - Going from left to right across a period, the first ionization energy increases (since effective nuclear charge increases and atomic radii decrease). - Going from up to down in a group, the first ionization energy decreases (since effective nuclear charge only increases slightly but atomic radii increase largely). $Be$ and $Ca$ both belong to the same 2A group. From up to down, $Be$ appears first, then comes $Ca$. Therefore, the first ionization energy would decrease from $Be$ to $Ca$. So $Ca$ has smaller first ionization energy.
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