The formal charge on nitrogen in NO3- is , where the Lewis structure of the ion is: There is a Lewis structure of NO3 minus ion. The nitrogen atom is connected with one oxygen atom by a double bound and this oxygen atom has two lone pairs of electrons. Each of other two oxygen atoms has three lone pairs of electrons and is connected to the nitrogen atom by a double bond. The formal charge on nitrogen in NO3- is , where the Lewis structure of the ion is: There is a Lewis structure of NO3 minus ion. The nitrogen atom is connected with one oxygen atom by a double bound and this oxygen atom has two lone pairs of electrons. Each of other two oxygen atoms has three lone pairs of electrons and is connected to the nitrogen atom by a double bond. 2 1 -2 -1 0