What about the middle structure?
Nitrogen should have five electrons and this one nitrogen
formally has one, two, three, four, five, six so
this one is a minus one formal charge.
That's a little bit better than the one above it in terms of that nitrogen.
The central nitrogen still has a positive formal charge.
It should have five and this one only owns four.
So 5 minus 4 is plus 1 there.
And the oxygen on the right has, should have six electrons.
And this oxygen does have six.
So no formal charge on that one.
If I was going to draw boxes around these structures,
I don't need to draw the box around the calculation,
do I, but I could draw a box around that one.
And now I can draw a box around this one.