Chemistry 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0078021510
ISBN 13: 978-0-07802-151-0

Chapter 7 - Quantum Theory and the Electronic Structure of Atoms - Questions & Problems - Page 318: 7.84

Answer

Please see the work below.

Work Step by Step

The ground state electronic configuration of copper is $[Ar]3d^{10}4s^{1}$ and the ground state of Chromium is $[Ar]3d^{5}4s^{1}$. Although the energy of the 4s orbital is less than the 3d orbital, it is not completely filled. This is due to the fact that fully filled and half-filled orbitals are more stable and possess minimum energy.
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