According to the Lewis dot structure for ozone, what is the formal charge on the central oxygen atom?

 

Formal charge in central O= valence electron $-\frac{1}{2}x$ bonding electron −non- bonding electron 

$=6-\frac{1}{2}\times 6-2=+1$ 

The formal charge on the central oxygen atom in ${\mathrm{O}}_3$ molecule is +1.