Exceptions to the Octet Rule

[Natalie Benitez 1E]

I remember that there were certain exceptions to the Lewis structure in regards to the octet rule, however, I don't understand the logical/reason behind it. Can someone please explain?

[DarrenKim_1H]

Exceptions to the octet rule generally have to deal with molecules that have an odd number of electrons, which is different from normal orbitals being able to accept an even level

[Chem_Mod]

The most common exception to the octet rule is a molecule or ion with with at least one atom that possesses more than an octet of electrons. These compounds are found for elements of period 3 and beyond. For example, sulfur can accommodate more than eight valence electrons by using one or more d orbitals.

[Mulin_Li_2J]

Generally speaking, Octet Rule exception has something to deal with the special structure of the atom. For example, H and He only have 1s orbitals at their ground state. Thus, 2 electrons is their Octet. Another example would be Al and B. Those two atoms can maintain a stable structure with only 6 electrons. Or, in fact, S can take up to 12 electrons due to its property of expanded valence shell. For more specific examples and explanations, you can find on this website: https://chem.libretexts.org/Bookshelves ... _Chemistry)/Chemical_Bonding/Lewis_Theory_of_Bonding/Violations_of_the_Octet_Rule

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