Subject: What is the proper lewis structure for NO2, and its properties?

On a recent test of mine we had to draw NO2's lewis structure and say if 
it is polar and/or linear.  I found drawings of the lewis structure in 
many places, but all seem to have different answers.
I am interested if it is linear or not (most lewis dot diagrams show the 1 
electron on the nitrogen, but no bent shape), and if it is linear, whether 
it's resonance structures combined, would make it non-polar.

Thanks, Ryan

Re: What is the proper lewis structure for NO2, and its properties?