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How to calculate formal charge...?? |
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Answer» Formal charge= total no.of valence electrons-total no. of lone pair electron-1/2 total no.of bonding electron The formal charge over an atom of a polyatomic molecule or ion is the difference between the valence electron of that atom in the elemental state and the number of electrons assigned to that atom in Lewis structure.Mathematically, it can be expressed by following formula:F.C. = [Total no. of valence e–\xa0in free state] – [total no. of e–\xa0assigned in Lewis structure] F.C. = [Total no. of valence e–\xa0in free state] – [total no. of non-bonding pair e–\xa0(lone pair)] – 1/2 [total no. of bonding e–]The factor of ½ is attached to the no. of bonding e–\xa0because bonding e–\xa0is shared between two atoms. |
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