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 23 - Problems: 23.26

Answer

See explanation below.

Work Step by Step

The abnormal small size of Au atoms becaise of the lanthanide contraction indicates that its electrons are tightly held, which is the reason for low reactivity. The Group 1A elements do not show the lanthanide contraction.
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