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Noble gases do not formmolecules. In case of noble gases, the atomic radii corresponds to van derWaalтАЩs radii. On the other hand, the atomic radii of other elements correspondto their covalent radii. By definition, van der WaalтАЩs radii are larger thancovalent radii. It is for this reason that noble gases are very large in sizeas compared to other atoms belonging to the same period.