Azide ion - N3-?

Question

Azide ion - N3-?
How do i draw a dot and cross diagram of this - i know that each
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Nitrogen atom is double covalently bonded by the ion is N3 (minus) so does this mean in one of the doulbe bonds there will be one less electron or what how do i draw it?

Answer 1

Although there are a number of different resonance structures, the most important puts a double bond between the central N and each of the other N atoms. There are 2 lone pairs on each of the noncentral N atoms.

There should be 16 valence electrons in your structure: 5 from each of the 3 N atoms, and 1 more due to the -1 charge of the ion.

Answer 2

The central nitrogen has a positive charge, the other 2 negative. Each N has a full octet. + -N=N=N- Draw two lone pairs on each end nitrogen, and none on the central.

Answer 3

N = N -> N -
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The first and second N have triple bond. The second and third N have dative bond.

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