Expanded Octet

[Jose Robles 1D]

Why and how are some elements allowed to overlook the octet rule?

[Lauren Bui 1E]

some elements, especially beyond the 3rd period, can have an extended octet (aka hypervalency). for example, in the 4s block, the 3d is not full yet and can accept more electrons.

[AVerma_F19]

It's because elements in Period 3 and higher have available space in the d shell to accommodate more electrons.

[Emily Vainberg 1D]

Since the d shell has space for more electrons (10 in d shell compared to 6 in p shell) then certain elements can have expanded octets. The most common elements with expanded octets are Sulfur, phosphorus, silicon, and chlorine.

[Anthony Hatashita 4H]

Element in the third period or further can have an expanded octet because the electrons and go into the d-orbital.

[AngieGarcia_4F]

If they have a d orbital they can expand their octet

[Jocelyn Thorp 1A]

how can we know if they're likely to use the expanded octect though?

[AmyL_3L]

Elements in the third period and beyond are able to have expanded octets since they have more space in the d-orbital.

[mayarivers3I]

Elements with a d orbital, which are in the third period and beyond, can have an expanded octet.

[PriscillaLi_3G]

Some elements (such as period 3) have empty d orbitals that can accommodate more electrons, and so we can overlook the octet rule for those atoms.

[emwoodc]

elements beyond the 3rd period have extra room to take the extra electrons in! which allows it to be expanded