Exceptions to Octet Rule

[aphung1E]

Is it true that elements located in period 3 specifically elements Al-Ar are an exception to the octet rule? And if so why?

[romina_4C]

Yes, elements in period 3 and on are exceptions to the octet rule (can have an expanded octet) because they have a d-orbital that is not filled and that can accept electrons (this is because the d orbital starts existing/being found when n=3, as in you can have a 3d orbital but not a 2d or 1d orbital).

[AniP_2D]

Yes, elements Phosphorus and onward can hold more than 8 electrons in their shell and thus can exceed the octet rule.

[Madeline Phan 1E]

Yes, elements from period 3 and onward have a d shell that can still add on extra electrons.

[AronCainBayot2K]

Elements in the third period can have more than 8 electrons and are the only exceptions to the octet rule. For example, Cl would be an exception.

[Justin Quan 4I]

Due to the fact that elements in the third period elements have a d-orbital shell, they can exceed the octet rule and hold the additional electrons

[ThomasNguyen_Dis1H]

With an n value of 3, the value of l can be 2 which is the d subshell. Since they have access to d orbitals, they are able to hold extra electrons in this orbital.

[Kurtis Liang 3I]

Yes, these elements can exceed the octet rule because their empty d-subshell can take on electrons if needed, thus letting the atom hold more than 8 valence electrons.