formal charge

(Polar molecules, Non-polar molecules, etc.)

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Kiara1F
Posts: 64
Joined: Fri Sep 25, 2015 3:00 am

formal charge

Postby Kiara1F » Sun Oct 25, 2015 5:59 pm

For the best structure does the central atom have to have a formal charge of 0?

Chem_Mod
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Re: formal charge

Postby Chem_Mod » Sun Oct 25, 2015 7:12 pm

Yes, but it will not always be possible. Remember that it's most important to satisfy the octet rule for second period elements.

Stevie Wisz
Posts: 59
Joined: Fri Sep 25, 2015 3:00 am

Re: formal charge

Postby Stevie Wisz » Mon Oct 26, 2015 5:29 pm

so, say when comparing two resonance stuctures and everything is similar except one of the structures has a formal charge of -1 while the other has that of +1... what would be the more stable? the stucture with the positive 1? Thanks!

Jana Sandhu 3J
Posts: 25
Joined: Fri Sep 25, 2015 3:00 am

Re: formal charge

Postby Jana Sandhu 3J » Thu Oct 29, 2015 10:27 pm

^The above scenario is something I've never heard of or encountered so I can't give a definite answer for that. However, if two different resonance structures both yield an overall formal charge of 0, the more stable one is one in which more individual atoms have a charge of 0, so if one structure yielded a formal charge of 0 only because 3 atoms' charges canceled out, but another structure only required 2 atoms' charges cancelling out, then the latter is the more stable and thus more favorable structure. Hope that helped!


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