Lowest Energy

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annikaying
Posts: 94
Joined: Sat Sep 14, 2019 12:16 am

Lowest Energy

Postby annikaying » Sun Nov 03, 2019 9:11 am

How do you determine the lowest energy lewis structure? For example some structures break the octet rule to get the lowest energy structure. Does that mean formal charges are more important than the octet rule in determining the lowest energy?

madijohnson_4A
Posts: 40
Joined: Fri Aug 30, 2019 12:18 am

Re: Lowest Energy

Postby madijohnson_4A » Sun Nov 03, 2019 10:23 am

The best way to determine the lowest energy structure is to look at the formal charge: the closer to zero the formal charge is, the more energetically favorable the structure is.

rabiasumar2E
Posts: 108
Joined: Thu Jul 11, 2019 12:15 am

Re: Lowest Energy

Postby rabiasumar2E » Sun Nov 03, 2019 10:26 am

Ideally you want your central atom to have a formal charge of zero or as close as you can get to it. The octet rule can only be broken if that element is able to break it. Elements from period three or higher have d-orbitals, allowing them to accommodate for more electrons. So just make sure that if you are breaking the octet rule to obtain a better formal charge for your central atom that you are able to !


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