We know that dimers of halide ions are called halogens, In the similar way covalent dimers of the pseudohalide ions are called pseudohalogens or halogenoids.
The pseudohalogens known are :
Cyanogen (CN)2
Oxycyanogen (OCN)2
Thiocyanogen (SCN)2
Selenocyanogen (SeCN)2
Tellurocyanogen (TeCN)2
Azido carbon disulphide (SCSN3)2
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