The azide ion, represented as N3^-, is a linear anion composed of three nitrogen atoms. It is known for its distinctive structure, where the terminal nitrogen atoms are bonded to the central nitrogen atom. Azide ions are commonly found in various chemical compounds, particularly in explosives and pharmaceuticals. Azides can be synthesized through several methods, including the reaction of sodium azide with alkyl halides. They are notable for their reactivity, especially in the presence of heat or shock, which can lead to rapid decomposition. This property makes azides useful in applications such as click chemistry and as precursors in organic synthesis.