What is the formal charge on N in HNO2?

HNO2 has the correct structure of HON=O, with the nitrogen having a lone pair of electrons.

The formal charge is calculated this way:

FC=valence e – surrounding electrons.

Therefore, the N is surrounded by three electrons (1 from a single bond and 2 from a double bond) and a lone pair:

Formal charge of N = 5 – (3+2) = 0

The formal charge is zero.

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