Which of the following mathematical expressions gives the formal charge (FC) on an atom as it appears in a Lewis structure?
a) FC=(valence electrons)−[non-bonding electrons+2×(number of bonds)]
b) FC=(valence electrons)−[non-bonding electrons+(number of bonds)]
c) FC=(valence electrons)−[non-bonding electrons+2bonding electrons]
d) FC=(valence electrons)−[2non-bonding electrons+bonding electrons]