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my TA was using the FC equation in class, but his differed to the one that Lavelle was showing in lecture. My TA used FC=V-(L+S/2*B) he stated that B is defined as bonding, but I was confused as to what we would use as an input for that variable B. Can anyone explain?
Honestly, while memorizing the equation is fine and good, I like to tally up the number of electrons to subtract by simply counting each bond as one electron as each lone pair as two electrons. For example, if I saw a double bond, a single bond, and two lone pairs around a hypothetical atom, I could pretty quickly add up 3 electrons (1 from each bond) and 4 electrons (2 from each lone pair) to get a total of 7 electrons that I would then subtract from the number of valence electrons to get the formal charge.
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