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 8 - Problems: 8.16

Answer

Hund’s rule states that electrons will occupy empty orbitals in a given sub-level (with parallel spins) before filling half-filled orbitals. The lowest energy arrangement has the maximum number of unpaired electrons with parallel spins.
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Work Step by Step

This means the lower energy arrangement will be attained by occupation of one electrons in each orbitals followed by pairing of electrons in the orbitals.
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