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Argon Compounds
Argon is a noble gas, and therefore generally considered to be inert.
In August 2000, the first argon compounds were formed by researchers at the University of Helsinki. By shining ultraviolet light onto frozen argon containing a small amount of hydrogen fluoride, argon hydrofluoride (HArF) was formed. It is stable up to 40K (-233°C). The discovery of argon difluoride (ArF2) was announced in 2003.
No useful or commercial compounds of argon exist at this time.