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Give reasons for the following: Atomic size of group 18 [0 group] elements is more than the atomic size of group 17 [VIIA] elements.

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Answer

The outer shell of group 18 [0 group] elements is completely filled. Due to this force of repulsion is maximum. The effect of nuclear pull over the valence shell electrons is not seen. Hence, Atomic size of group 18 [0 group] elements is more than group 17 [VIIA] elements.

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