why do noble gases have comparatively large atomic sizes?

It is so because in case of inert or noble gases all the orbitals are completely filled means they have s2 p6 configuration and hence inter electronic repulsions are maximum. Moreover in case of noble gases atomic radius is determined by vandervals radius which is larger than both ionic as well as covalent radii. So, nobel gases are larger in atomic sizes.

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noble gases have van der waals radii ,while  others have covalent radii. van der radii is larger than covalent radii .so noble gases have comparatively large atomic sizes.

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