8 valence electrons

[Sofia Q]

In class we said how elements P, S, and Cl can have exceptions to the octet rule, but I was wondering if any other elements could too, or should I just keep these three in mind?

[Isabella Dal Porto 1H]

Hydrogen and Beryllium are also exceptions to the octet rule because they often form incomplete octets (less than 8 valence electrons). Overall, I would just focus on P, S, Cl since they are the most common elements that make stable compounds with expanded octets.

[John Arambulo 1I]

Any of the elements in the third principal energy level and higher because they can accommodate more electrons with their d- orbitals. Other common examples are Si and Xe.

[ZevMarx-Kahn3C]

Dr. Lavelle mentioned the octet guideline only being applicable to a certain array of atoms...what are these atoms? Is it ones without d-orbitals?