Answer
See the answer below.
Work Step by Step
18 valence electrons:
$\begin{smallmatrix}
H&-&\ddot{O}&-&\ddot{N}&=&\ddot{O}\\
&&\ddot{}&&&&\ddot{}
\end{smallmatrix}$
No ressonance structure possible.
All atoms have 0 formal charge since their number of bonds is equal to the number of electrons required for the octect.
