Answer
Ca and Mg are in the same group. Ca is lower than Mg, and ionization energy decreases down a group.
Work Step by Step
Ca is located to the right of K. Periodic trends indicate that it will have a higher ionization energy.
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: 4.101
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