Question

why inert elements are bigger than halogen

Answer 1

The noble gases have completely filled outer nd inner shells so an repulsive force acts between the electrons resulting in a larger atomic size compared to thehalogens.This is due to the reason that in case of inert gases, the outer shell is complete and it has hence maximum electronic repulsion.
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Answer 2

hyy..

it is because of the reason that vanderwaal's radii(present in noble gases) is much larger than ionic radii in halogen.

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