What is the formal charge of the central Nitrogen atom in the Nitrite ion (NO2-)? (Hard)
Answer and explanation
Correct answer: C. 0
- Step 1: Formal charge formula: FC = Valence electrons - Non-bonding electrons - (1/2) Bonding electrons. Step 2. For N in [O=N-O]-: Valence = 5, Non-bonding = 2 (one lone pair), Bonding = 6 (one double bond + one single bond). FC = 5 - 2 - (6/2) = 5 - 2 - 3 = 0. Answer: 0. Why not the others: +1 is the formal charge of N in nitrate or NO2+; -1 is on the single-bonded oxygen atom; +2 is non-physical.
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