Question

1. which element has the largest atomic radius?

Explanation:

Step1: Recall atomic - radius trend

Atomic radius increases down a group and decreases across a period.

Step2: Analyze positions of A, B, C, D

Assuming the grid represents the periodic - table layout, element B is located at the bottom - left position among A, B, C, D. Since it is in a lower period and a left - hand group compared to the others, it has the largest atomic radius.

Answer:

B.