Chemistry: The Molecular Nature of Matter and Change 7th Edition

Published by McGraw-Hill Education
ISBN 10: 007351117X
ISBN 13: 978-0-07351-117-7

Chapter 2 - Problems - Page 87: 2.120

Answer

Please see the work below.

Work Step by Step

The bonding increases with charge and decreases with radius size. As magnesium and oxygen as a pair have more charge and less radii while Rb and I have more radii and less charge, MgO has strongest ionic bonding and RbI has weakest ionic bonding.
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