Why doesn't N3- have a dipole moment arrow from the central atom?

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Sho Kano
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My teacher posted on his website, Lewis structures of different compounds. One of them were N3-
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Why isn't there a dipole moment arrow pointing from the central atom to the other Nitrogen? Does the arrow only point from neutral atom to negatively charged atom?
 
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I am not sure I understand your question.

First of all - is it obligatory to mark a dipole in the Lewis structure?
 
Borek said:
I am not sure I understand your question.

First of all - is it obligatory to mark a dipole in the Lewis structure?
Don't know but He wants it done