Exceptions to the Octet Rule

Reminder about the Octet Rule

"Atoms tend to gain, loseor shareelectrons until they are surrounded by 8 valence electrons"

Exceptions to the Octet Rule

Example on Atoms with a total odd number of electrons: NO Molecule

Total number of valence electrons = 5 (of N) + 6 (of O) = 11 (odd number)

Example on Less than Octet: BF3 Molecule


Despite these correct resonance structures, they are not possible due to the unacceptable formal charge on F.

Example on More than Octet: PCl5 Molecule


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Date of last modification: 2021