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For determining formal charge, it is the number of valance electrons minus the amount of lone electrons and the number of electrons in bonds divided by two. Thus the FC = V - ( L + S/2). A easier way of thinking of the problem in terms of the shared electron is to just consider the number of bonds it has rather than number of electrons in bond divided by two.
When calculating formal charge it is easiest just to take the number of valence electrons and subtract the number of bonds (same thing as the number of bonded electrons/2) and subtract the number of lone pair electrons. The resulting number is your formal charge. Do this for each of the atoms of your molecule and then add up all the formal charges to give you the total charge of your atom.
Formal charge is found by the formula FC= V - (L+(s/2)) where v is the amount of valence electrons of the atom, L is the amount of lone pair electrons, and s/2 is the amount of bonds shared, which can be figured out by divided the electrons shared by 2.
Also make sure that you memorize the equation or know the concept behind calculating formal charge, because Dr. Lavelle said that he won't provide the equation on the reference sheet!!
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