Octet Exceptions

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Harjot Manku 1C
Posts: 21
Joined: Fri Sep 20, 2013 3:00 am

Octet Exceptions

Postby Harjot Manku 1C » Sun Jul 23, 2017 10:09 pm

Do the Octet Exceptions elements start in Period 3 P-block?

Chem_Mod
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Re: Octet Exceptions

Postby Chem_Mod » Sun Jul 23, 2017 10:16 pm

Yes, and the octet expansion can occur because the 3d orbitals are available to occupy additional electrons.

504754253
Posts: 45
Joined: Fri Jun 23, 2017 11:39 am

Re: Octet Exceptions

Postby 504754253 » Sun Jul 23, 2017 10:59 pm

how do we know the number of bonds possible for elements in a structure that are exceptions for the octet rule?

Janet Nguyen 2H
Posts: 51
Joined: Fri Sep 29, 2017 7:05 am

Re: Octet Exceptions

Postby Janet Nguyen 2H » Tue Oct 31, 2017 12:12 am

I think you can figure it out using formal charge and electronegativity. For instance, in SO4 2- the S has a formal charge of 0 when there are 2 double bonded O's which is more favorable than having only one double bonded O. However, it cannot have 3 double bonded O's because then it would have a FC of -1 and O is the more electronegative element so it would have the FC of -1, not the S


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