Answer :
Noble gas is only group of elements that do not form ions and are found as monatomic atoms in nature .
Monoatomic elements are elements which are stable and are single atoms. Hence, chemical elements that are stable single atom molecules at standard temperature and pressure are noble gases. Examples include helium, neon, argon, krypton, xenon, and radon.
Noble gases are relatively inert or nonreactive. They also exist as single atoms instead of molecules. Reason behind their inert, or nonreactive nature ,is because their s and p orbitals are filled. So, they do not form ions or compounds.
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