Question

Why do noble gases have bigger atomic size than halogens?

Answer 1

because noble gas has fully filled shells with electrons so internuclear forces exerted on electrons by nucleus is comparatively low which make the electrons away from each other that led to increase in their atomic size

whereas in halogens there are comparatively less number of electrons in the c
shells which increase internet less forces and the nucleus attract the electrons towards itself which make decrease in their atomic size

so noble gas have bigger atomic size

#MK