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Formal charges and full valence shells

Posted: Sat May 12, 2018 3:13 pm
by Alicia Yu 1A
What is the relationship between having full valence shells and formal charges? Do full valence shells always result in a formal charge of zero?

Re: Formal charges and full valence shells

Posted: Sat May 12, 2018 5:43 pm
by Salena Chowdri 1I
There's no direct relationship between formal charges and full valence shells. Full valence shells do no always result in a formal charge of zero, they can result in formal charges of -1,+1 and others. The formal charge is calculated by subtracting the sum of the number of lone pair electrons and the number of bonded electrons from the number of valence electrons of the specific atom.

Re: Formal charges and full valence shells

Posted: Sat May 12, 2018 7:06 pm
by Neha Divi 1K
The formal charge is the difference between the number of valence electrons "belonging" to the bonded atom and those in the full valence shell. And, no the formal charge is not always 0, but that is when it has the lowest energy.

Re: Formal charges and full valence shells

Posted: Sun May 13, 2018 2:37 am
by Steven Luong 1E
Formal charge is the relative charge of an atom relative to other atoms within the same molecule. Valence electrons just resemble outer electrons and may or may not be used up as bonds in the molecule; it is used for calculation of the formal charge.