Chemistry and Chemical Reactivity (9th Edition)

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: 74


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K is in group 1 and Ca in group 2. In the first ionization of K, it achieves a very stable noble gas configuration whilst in the second it has to break it. Thus, its second ionization energy is much higher than its first.
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