Atomic size of group 18 element(0 group) is more than the atomic size of group 17(VIIA) elements. Why?
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Across the period in the periodic table, atomic size decreases up to halogens(group-17 elements) but increases in noble gases(group-18 elements). This is because in case of inert or noble gases all the orbitals are completely filled and hence inter electronic repulsions are maximum.
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