# How to Calculate Formal Charge?

The charge assigned to an atom in a molecule is formal charge. This is calculated by the equation FC=V-N-2. V=valence electrons, N=non-bonding electrons, B= number is electrons shared in covalent bonds.
Formal charge is defined as the apparent charge of an atom present in a given compound. It is calculated by subtracting the number of valence electrons present in the neutral atom from the number of electrons in lone pairs + 1/2 of the number of electrons in bonds. You can obtain the number of valence electrons from the periodic table.
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 1. Draw a Lewis structure for the molecule. 2. Find the group number of each atom in the molecule using the periodic table. The group number can be found above each column on the http://www.ehow.com/how_8547418_calculate-formal-c...
 to calculate the formal charge: Take the number of valence electron the neutral atom would have (found on the periodic table) and subtract it from the number of electrons in lone http://wiki.answers.com/Q/How_do_you_calculate_for...
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 Formal charge equation = ( of valence e - in free atom) - 1/2 http://www.chacha.com/question/what-is-the-equatio...
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