Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning
ISBN 10: 1285199049
ISBN 13: 978-1-28519-904-7

Chapter 6 - Covalent Bonding - Questions for Review and Thought - Topical Questions - Page 283c: 60b

Answer

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Work Step by Step

The first one that has an exception is $BCl_3$, for the Boron will only have 6 valence electrons in the correct lewis structure. The other exception is $NO$, for while the triple bond allows Nitrogen to have a full octet, the Oxygen will have one extra valence electron.
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