The largest atomic radius among the listed elements is for Li, Na, Mg, Al, Cs.

Cesium has the largest radius of the atom among the listed chemical elements, since this chemical element is in group I and in period 6. We know that the radius of the atom increases in the group from top to bottom, and the period decreases from left to right. Hence, it turns out that Cesium is in the 6th period, which is below all the above listed elements in the group, and also Cesium is in the I group, which is located to the left of other chemical elements.

Answer: Cs.



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