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The noble gases have weak interatomic force, and consequently have very low melting and boiling points. They are all monatomic gases under standard conditions, including the elements with larger atomic masses than many normally solid elements.
Only in the laboratory can we force some inert gases to form compounds. And all these compounds are highly unstable. Yes, noble gases can form compounds, but with great difficulty. And more so with the heavier gases (higher atomic number/weight) than with the lighter ones. The noble gases are generally considered to be inert, or lacking any reasonable way to form chemical bonds with other elements. That's what makes them noble or inert. Only in the laboratory can we force some inert gases to form compounds. And all these compounds are highly unstable.