Are oxides of group 18 amphoteric?
Group 18 elements are noble gases. He and neon are completely
inert. Reactive compounds have been made for the heavier ones.
Xenon has some well documented oxides such as XeO3 , XeO4 . Xenon
fluorides and oxyfluorides are also known. The Xenon oxides react
in alkaline medium with base like NaOH to produce Xenate ions such
as Na+[HXeO4]- . XeO4 reacts with water to form perxenic acid. This
shows that they are Acidic in nature.
Less isknown about krypton oxides and very little about
Radon.