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.