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: 23.6

Answer

See explanation below.

Work Step by Step

The greater than expected decrease of radii of lanthanide elements from atomic number 57 to 71 is termed as lanthanide contraction.The size increases from period 4 to period 5, but remians almost constant from period 5 to period 6. However, atomic mass increases from period 5 to period 6, but there is a little increase in volume, because of which period 6 elements are dense.
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