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 281d: 65


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Work Step by Step

a) In Al the electron is removed from a 3p orbital, which, from Aufbau's principle, has a less negative energy level than the 3s orbital from where the electron in Mg is removed. b) The electron removed from S has a pair in the same orbital, whereas for P it's unpaired. The repulsion between electrons explains why it's easier to remove the paired one.
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