"best" lewis structure

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Salma Sudarmadji 2I
Posts: 21
Joined: Fri Jul 15, 2016 3:00 am

"best" lewis structure

Postby Salma Sudarmadji 2I » Wed Oct 26, 2016 7:55 pm

When drawing the "best" lewis structure, do the most electronegative atom always receive the charge in ionic bonds?

Thanks

paulapedrani
Posts: 27
Joined: Wed Sep 21, 2016 2:56 pm

Re: "best" lewis structure

Postby paulapedrani » Wed Oct 26, 2016 8:17 pm

The best Lewis structure is one where the FC is zero. Ideally, you want the FC to be between one and negative one. The overall charge is the same as each one's FC combined. So if it's CN-, you would want the addition of all the formal charges to be negative one

Brandon_Wu_2L
Posts: 13
Joined: Wed Sep 21, 2016 2:56 pm

Re: "best" lewis structure

Postby Brandon_Wu_2L » Fri Oct 28, 2016 2:04 am

Additionally you would rather have the central atom have a FC of 0. If FC=0 cannot be achieved for all the atoms, it is better to put the negative FC on the most electronegative atom.

Jasleen Kaur 1J
Posts: 21
Joined: Wed Sep 21, 2016 2:57 pm

Re: "best" lewis structure

Postby Jasleen Kaur 1J » Fri Oct 28, 2016 2:27 pm

Yes. when forming the bonds you want to try and get the central atom with fc of 0.


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