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The formal charges of $\mathrm{C}$ and $\mathrm{O}$ atoms in $\mathrm{CO}_2(\ddot{O}=\mathrm{C}=\ddot{\mathrm{O}}$ :) are, respectively
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Formal charge $(\mathrm{FC})=\left[V-l p-\frac{1}{2} b p\right]$
[where, $V=$ valence electrons, $l p=$ lone pair and $b p=$ bond pair]
For
< smiles>O=C=[18O] < /smiles>
$\mathrm{FC}$ of $\mathrm{O}=6-4-\frac{1}{2} \times 4=0$
$\mathrm{FC}$ of $\mathrm{C}=4-0-\frac{1}{2} \times 8=0$
[where, $V=$ valence electrons, $l p=$ lone pair and $b p=$ bond pair]
For
< smiles>O=C=[18O] < /smiles>
$\mathrm{FC}$ of $\mathrm{O}=6-4-\frac{1}{2} \times 4=0$
$\mathrm{FC}$ of $\mathrm{C}=4-0-\frac{1}{2} \times 8=0$
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