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When the element moves from group 18 to group 1, it moves to a new period. Each period has a one more electron shell than the previous. The group 1 element has one more electron shell than the group 18 element; hence, it's atomic radius is greater.

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Q: Why is there a sudden jump in the atomic radius in elements in group 18 and the next higher element in the next period in group 1?
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