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Formal Charge

Posted: Thu Nov 01, 2018 6:48 pm
by Heidi Ibarra Castillo 1D
How do you determine your V, L , and S?

Re: Formal Charge

Posted: Thu Nov 01, 2018 7:36 pm
by Jessica Chen 1F
V is the # of valence electrons the atom has (look at the periodic table, count over groups from left to right)
L is how many lone electrons that element has on its Lewis structure
S is the number of shared electrons between multiple atoms' Lewis structures

Re: Formal Charge

Posted: Thu Nov 01, 2018 8:20 pm
by Desiree1G
V is for valence electrons, L is for lone pair of electrons, and then S is for shared electrons. Don't forget also the formula V-(L+S/2)

Re: Formal Charge

Posted: Thu Nov 01, 2018 11:22 pm
by Henry Krasner 1C
V, as above stated valence electrons, can be calculated by looking at the periodic table for instance.
L, lone electrons, are the dots surrounding an element, made to represent an electron.
S, shared electrons, are the lines connecting two elements, thus "sharing" them.

Re: Formal Charge

Posted: Thu Nov 01, 2018 11:25 pm
by Jack Mitchell 3J
To find "s" write the Lewis dot structure and then count the number of bonds that they form. however, don't forget to divide it by two in the equation.

Re: Formal Charge

Posted: Thu Nov 01, 2018 11:49 pm
by John Kim Lec3Dis3L
Heidi Ibarra Castillo 1D wrote:How do you determine your V, L , and S?


Rules for determining FC from the notes from class:
1. Determine number of valence e- for each bound atom
2. Determine number of bonding electrons (S)
3. Determine number of lone e- pairs (L)
4. Determine number of valence e- for each free atom (V)

Re: Formal Charge

Posted: Sun Nov 04, 2018 6:01 pm
by Heidi Ibarra Castillo 1D
thank you !

Re: Formal Charge

Posted: Sun Nov 04, 2018 9:08 pm
by Angel Chen 2k
Based on the definition of the formal charge, we can get an easier way to calculate it.

(Number of available valence electrons)-(dashes and dots)

--dashes are half of the bonding electrons (or bonding pairs)

--dots are the non-bonding electrons.

Hope this makes the calculation easier.

Re: Formal Charge

Posted: Sun Nov 04, 2018 9:18 pm
by Lydia Luong 4L
v= valence electrons, l= lone pairs, s= shared electrons