One of several trends found in the periodic table relates to the atomic radius or the size of an atom. The general trend in atomic radius is that moving down the periodic table, the size increases; moving across the periodic table from left to right, the size decreases. Therefore, rubidium has the largest atomic radius whereas helium has the smallest. Trends in the atomic radius showing that moving down the periodic table, size increases, whereas moving across the periodic table from left to right, size decreases.What factor causes the atomic radius to increase while moving down the periodic table, from top to bottom?

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