Chemistry 9th Edition

Published by Cengage Learning
ISBN 10: 1133611095
ISBN 13: 978-1-13361-109-7

Chapter 7 - Atomic Structure and Periodicity - Exercises - Page 346: 106

Answer

a. $Be < Na < Rb$ b. $Ne < Se < Sr$ c. $O < P < Fe$

Work Step by Step

a. As you go downwards in the periodic table, the atomic radius increases because orbital size increases with an increase in the principal quantum number, n. Therefore, the order by the periodic table is $Be < Na < Rb$. b. As you go downwards in the periodic table, the atomic radius increases because orbital size increases with an increase in the principal quantum number, n. Therefore, the order by the periodic table is $Ne < Se < Sr$. c. As you go downwards in the periodic table, the atomic radius increases because orbital size increases with an increase in the principal quantum number, n. Therefore, the order by the periodic table is $O < P < Fe$.
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