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Why do noble gases have comparatively la...

Why do noble gases have comparatively large atomic sizes?

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The correct Answer is:
(i)They exist as monoatomic molecuels and therefore, radius is measured as vander Waal's radius, `r_("vander Waal") gt r_("covalent").`
(ii)They have completely filled valance shells.As all electrons are paired there are inter electronic repulsions. This leads to expand the electron cloud.
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