Chemistry 9th Edition

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

Chapter 8 - Bonding: General Concepts - Active Learning Questions - Page 404: 9

Answer

See explanation

Work Step by Step

The second oxygen and sulfur affinity to the electron is endothermic due to electrostatic repulsion. The first attraction to electrons would be exothermic as energy is released when a negative electron is attracted by the positive nucleus. However, if an electron is produced from oxygen and sulfur, it becomes negative ions (O- and S-, respectively). Then, adding an electron is undesirable, since electrostatic repulsion can occur between the electron and the negative ion. Energy would then need to be used to add a second electron — hence the second electron affinity will be endothermic.
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