it has a non linear structure it is called pseudohalogen the formal oxidition STATE of nitrogen in this anion is -1 it is ISOELECTRONIC with `NO_(2)`
SOLUTION :AZIDE ion is linear. It is a pseudohalide ion. The formal OXIDATION state of N in `N_(3)^(-)` ion is -1 because in any of the resonating structure, the net charge on the ion is -1.