Question

The formal charge on $Cl$ in $HCl{O}_3\text{and}Cl{O}_3^{-}$ is:

• A. $0$ and $-1$ respectively
• B. $0$ and $0$ respectively
• C. $-1$ and $-1$ respectively
• D. $-1$ and $0$ respectively

Answer 1

The correct option is B $0$ and $0$ respectively

Formal charge on any atom is calculated as:
Formal charge $\left(FC\right)=V-L-\frac{B}{2}$

where,
V = Total number of valence electrons in the valence shell of the atom.
L = Total number of non bonding (lone pair) electrons of the atom.
B = Total number of bonding (shared) electrons of that particular atom.


Formal charge $=V-L-\frac{B}{2}=7-2-\frac{10}{2}=0$


Formal charge $=V-L-\frac{B}{2}=7-2-\frac{10}{2}=0$
Thus, formal charge on $Cl$ in $HCl{O}_3\text{and}Cl{O}_3^{-}$ is 0 and 0 respectively.