How to draw Lewis structure of molecules with N

AI Thread Summary
The discussion centers on the challenges of drawing accurate Lewis structures for molecules containing nitrogen, specifically H2CNN. The initial assumption of a double bond between carbon and nitrogen, with a single bond between the two nitrogens, is identified as incorrect due to the rightmost nitrogen having only a sextet of electrons. The correct approach involves converting a lone pair from the central nitrogen into a bond between the two nitrogens, ensuring that all atoms satisfy the octet rule. Participants express a desire for additional examples to practice similar problems, indicating a need for further exploration of Lewis structures involving nitrogen.
tinir
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Many times, I find it hard to draw correct Lewis structure of molecules with nitrogen. For instance: the Lewis structure of H2CNN. I thought it should be double bond between C and N and single bond between N and N, like this:
Photo on 3-17-13 at 1.54 PM_meitu_1.jpg

But actually it's not. I have done many problems like this wrong.

Please help me out! Thx!
 
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That's certainly a correct Lewis structure for this molecule. However, when viewed at as a representation of a valence bond structure, it may not be a structure with high importance.
The point is that the rightmost nitrogen has only a sextet. Transforming the lone pair of the central atom into a bond between the two nitrogens will lead to a structure fulfilling the octet rule on all atoms.
 
Thank you so much! It helps me a lot!
 
Could you give some more examples (just the molecular formula, not necessarily your attempts) of problems like this (since as you say you've tried several of them)? Because I originally did not get this one straight away and would love to work on a few more :)
 
OK, I will reply to you when I find those problems. I could not remember where exactly are they.
 

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