The elements that can form acidic compounds are; sulfur, arsenic, selenium, antimony, silicon.
Acidic compounds are formed by nonmetals. Metallic elements form basic compounds. This means that rubidium does not form acidic compounds since it is a metal.
Also, xenon does not form compounds because it is a noble gas. Noble gases do not react with other elements to form compounds.
However; sulfur, arsenic, selenium, antimony, silicon are nonmetals and they form acidic compounds.
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