Octet Exceptions and Expanded Octet Calculation

[Joshua Eidam 2A]

Hi, I am a little confused as to where exactly the cutoff is for elements that are able to have more than 8 electrons in their valence shell. Also, I am confused about how to calculate what the central atoms expanded octet is when given a lewis structure or just a formula?

[Siwa Hwang 3G]

Hi! p-black atoms from n=3 and higher can have extended octet since they have the d-orbital in valence shell that can fit additional electrons.

[CesarLec1]

Elements in the 2p must have an octet. The elements H,He,Be,Li never have an octet and B and Al usually have an incomplete octet. But as the person said above, elements in the 3p can expand their octets.

[Hailey Kang 2K]

Hi!
The main elements we definitely have to know for this class are P, S, and Cl. Other than that, anything with a d-orbital can have an expanded valence.