Write the formal charges on atoms in (i) and carbonate ion (ii) nitrite ion.

Explanation

The formal charges on the atoms in both these ions may be calculated as follows :
(i) Formal charge on atoma in carbonate ion

Formal charge on C atom `=4-0-1//2xx8=0`
Formal charge on double bonded O atom `=6-4-1//2xx4=0`
Formal charge on single bonded O atom `=6-6-1//2xx2=-1.`
(ii) Formal charge on atoms in nitrite ion

Formal charge on N atom =5-2-1/2`xx`6=0
Formal charge on double bonded O atom =6-4-1/2`xx`4=0
Formal charge on single bonded O atom =6-6-1/2`xx`2=-1.