Question

noble gases possess relatively large atomic size why ​

Answer 1

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.

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Answer 2

atomic size increases from left to right in the periodic table and noble gases are placed at the the end of the periods so they have comparitively large atomic size...

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