Answer
There will be only one other ressonance structure.
It will follow the first pattern.
The electrons from the pi bond will move to the oxygen so:
- The pi bond will be removed
- The oxygen will now have a negative formal charge.
- The carbon that had that pi bond will get a positive formal charge.
And, a lone pair from the nitrogen will form a pi bond between it and the positive carbon.
- There will be a pi bond between these two.
- The carbon will be neutral again.
- The nitrogen will get a positive formal charge.
Work Step by Step
1. Draw the lone pairs.
2. Find which pattern does that structure fits.
It is the first one, a lone pair (from the nitrogen) next to a pi bond.
3. Draw the arrows:
Follow the pattern for a lone pair next to a pi bond.
The electrons from the pi bond will move to the oxygen above them, so the carbon that lost the pi bond will get a positive charge.
Then, the lone pairs from the other nitrogen will form a pi bond with this positive carbon.
4. Do the changes based on the arrows.
* Don't forget the formal charges!
