The number of electrons in its outermost shell of Nitrogen ( 2s 2p ) is 5 .
1s2 2s2 2p3
The total number of electrons involved is calculated by adding the valence electrons involved (multiplied by the subscript) plus the ion’s overall charge. Resonance structures also must follow the octet rule (eight electrons per atom). There are 3 possible resonance structures of azide ion can be drawn.