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 281c: 51

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$In^{4+}, Sn^{5+}$ In is in group 13 and Sn in group 14 removing respectively 4 and 5 electrons from them would require removing one from an inner shell. $Fe^{6+}$ Removing 6 electrons from an atom is prohibitively expensive energetically.
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