Chemistry 9th Edition

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

Chapter 7 - Atomic Structure and Periodicity - Exercises: 109

Answer

a. He b. Cl c. Element 116 d. Si e. $Na^{+}$

Work Step by Step

a. Atomic radius tends to decrease as we go across a period due to increased effective nuclear charge or proton pull. Therefore, $He$ has the smallest radius. b. Atomic radius tends to decrease as we go across a period due to increased effective nuclear charge or proton pull. Atomic radius also tends to increase going down a group due to more principal energy levels. Therefore, $Cl$ has the smallest radius. c. Atomic radius tends to decrease as we go across a period due to increased effective nuclear charge or proton pull. Atomic radius also tends to increase going down a group due to more principal energy levels. Therefore, Element 116 has the smallest radius. d. Atomic radius tends to decrease as we go across a period due to increased effective nuclear charge or proton pull. Atomic radius also tends to increase going down a group due to more principal energy levels. Therefore, $Si$ has the smallest radius. e. Atomic radius is smaller in cations than in neutral or anions due to a greater effective nuclear charge or proton pull. Therefore $Na^+$ has the smallest radius.
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