expanded octet

[josmit_1D]

how do you know which molecules can have an expanded octet?

[Jamie Lee 1H]

an atom can usually have an expanded octet if it is
beyond period 3. common ones include sulfur, phosphorous, silicon and chlorine

[RasikaObla_4I]

The ones you probably need to know for this class would be sulfur, phosphorus, chlorine, and silicon because their electrons expand into the 3d orbital.

[claudia_1h]

When n is greater than or equal to 3 and the element is in the p block, an expanded octet is possible. This is possible because of the presence of the d sublevel.