Chemistry

Question Analysis
This question evaluates the understanding of periodic trends, specifically the trend in atomic radius down a group and across a period.

Key Concept Explanation
Atomic radius generally increases as you move down a group due to the addition of new electron shells. In Period 6, the elements listed are from different groups, and the element with the largest atomic radius will be the one farthest to the left in the periodic table.

Step-by-step Solution
1. Identify the elements and their positions in the periodic table: Cesium (Cs), Barium (Ba), Lanthanum (La), and Cerium (Ce).
2. Determine the group and period for each element:
Cesium (Cs): Group 1, Period 6
Barium (Ba): Group 2, Period 6
Lanthanum (La): Lanthanide series, Period 6
Cerium (Ce): Lanthanide series, Period 6
3. Compare the atomic radii based on their positions:
Cesium (Cs) is in Group 1, which is the farthest to the lef...