A positively charged ion or cation containing an azo group (N=N), formed when an azo compound gains or accepts a proton or electron.
From 'azo-' (N=N) + '-nium' (suffix for positively charged ions, from Latin -inium). Developed in 20th-century organic and physical chemistry.
Azonium ions are what happen when azo molecules get excited or charged up—they're more reactive than their neutral cousins and help chemists understand how azo compounds participate in reactions.
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