Chemistry 12th Edition

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

Chapter 9 - Chemical Bonding I - Questions & Problems: 9.59

Answer

Please see the work below.

Work Step by Step

As we know that fluorine obeys octet rule and thus has 8 valence electrons. In the given compounds $FH_7\space and FCl_7$, it will have 14 valence electrons which is the violation of the octet rule. That's why these compounds can never be prepared.
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