The Lewis structures for methyl azide are shown in the image.
There are three possible Lewis structures for methyl azide. A necessary element of all three is a separation of charges between two of the three nitrogen atoms. Although separation of charges is generally seen as unfavorable, here it is necessary in order to construct Lewis structures with full electron octets for the nitrogen atoms.
The exception is the third structure, in which the leftmost nitrogen atom has a sextet instead, lowering the overall stability of that resonance structure and making it the one with the smallest contribution in the resonance hybrid.
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