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 - Page 1047: 23.32

Answer

See explanation below.

Work Step by Step

Europium, a lanthanide element of atomic number 63.Its electronic configuration is:[Xe]6s2 4f7. The outermost 2s electrons are removed to form Eu2+ ion. So electronic configuration of Eu2+ is [Xe]4f7 Electronic configuration of Eu3+ is [Xe]4f6 Electronic configuration of Eu4+ is [Xe]4f5 Half filled f orbital in Eu2+ makes it more stable. b.Terbium, a lanthanide element of atomic number 65.Its electronic configuration is[Xe]6s2 4f9. The outermost 2s electrons are removed to form Tb2+ ion.Electronic configuration of Tb2+ is [Xe]4f9 Electronic configuration of Tb3+ is [Xe]4f8 Electronic configuration of Tb4+ is [Xe]4f7
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