The correct formula used to determine the formal charge $(Q_{f})$ on an atom in the given Lewis structure of a molecule or ion is ($V=$ number of valence electrons in free atom,$U=$ number of unshared electrons on the atom,$B=$ number of bonds around the atom)
- A$Q_{f} = V - (U / B)$
- B$Q_{f} = V + (U - B)$
- C$Q_{f} = V - (U + B)$
- D$Q_{f} = V - (B / U)$
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