| Number of atom | Total number of electrons in free atom $(V.E.)$ | Total number of non-bonding electrons $(N.E.)$ | Total number of shared electrons in bond $(B.E.)$ | Formal charge $\text { F.C } =(\text { V.E. })-(\text { N.E.) })-\frac{1}{2} \text { (B.E. })$ |
| $1$ | $6$ | $4$ | $4$ | $F.C =6-4-\frac{1}{2}(4)=0$ |
| $2$ | $4$ | $0$ | $8$ | $F.C =4-0-\frac{1}{2}(8)=0$ |
| $3$ | $6$ | $4$ | $4$ | $F.C =6-4-\frac{1}{2}(4)=0$ |
| Number of atom | Total number of electrons in free atom $(V.E.)$ | Total number of non-bonding electrons $(Ν.Ε.)$ | Total number of shared electrons in bond $(B.E.)$ | Formal charge $\text { F. } C=(\text { V.E. })-(\text { N.E. })-\frac{1}{2} \text { (B.E. })$ |
| $1$ | $6$ | $2$ | $6$ | $F.C =6-2-\frac{1}{2}(6)=+1$ |
| $2$ | $4$ | $0$ | $8$ | $F.C =4-0-\frac{1}{2}(8)=0$ |
| $3$ | $6$ | $6$ | $2$ | $F.C =6-6-\frac{1}{2}(2)=-1$ |
| Number of atom | Total number of electrons in free atom $(V.E.)$ | Total number of non-bonding electrons $(Ν.Ε.)$ | Total number of shared electrons in bond $(B.E.)$ | Formal charge $\text { F. } C=(\text { V.E. })-(\text { N.E. })-\frac{1}{2} \text { (B.E. })$ |
| $1$ | $6$ | $6$ | $2$ | $F.C =6-6-\frac{1}{2}(2)=-1$ |
| $2$ | $4$ | $0$ | $8$ | $F.C =4-0-\frac{1}{2}(8)=0$ |
| $3$ | $6$ | $2$ | $6$ | $F.C =6-2-\frac{1}{2}(6)=+1$ |
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