Which one of the following molecules or ions contains an exception to the octet rule?

Name: Which one of the following molecules or ions contains an exception to the octet rule?
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Question

Quizplus · Accepted Answer

XeCl contains an exception to the octet rule as xenon has 8 valence electrons and chlorine has only 7 valence electrons (due to its position in the periodic table). Therefore, XeCl has a total of 18 electrons in its valence shell, violating the octet rule.

Which One of the Following Molecules or Ions Contains an Exception