The most commonly used diagnostic tool for tuberculosis is a simple skin test, though blood tests are becoming more commonplace. A small amount of a substance called PPD tuberculin is injected just below the skin of your inside forearm. You should feel only a slight needle prick.
The structure has a double bond and an adjacent atom with a lone pair, so it could have resonance. The possible resonance structures are below. The first structure has the most common bonding pattern for all of its atoms, so it is a reasonable Lewis structure.
What are the correct resonance structures of nitrous oxide? There was a question in one of my exam papers to draw the resonance structures for $\ce{N2O}$. But the resonance structures I drew were not given marks. The top 2 structures are the ones I drew and the bottom 3 are the ones in the marking scheme.