Question

1. which of the following elements has the largest atomic radius? li be na mg 2) which of the following elements has the largest atomic radius? rh cd ir he

Explanation:

Step1: Recall atomic - radius trends

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

Step2: Analyze first set of elements

Li and Be are in the second period, Na and Mg are in the third period. Since the third - period elements are below the second - period elements, they are larger. Among Na and Mg, Na is on the left of Mg in the periodic table, so Na has a larger atomic radius.

Step3: Analyze second set of elements

He is in the first period, Rh, Cd, and Ir are in the fifth period. Fifth - period elements are larger than the first - period element He. Among Rh, Cd, and Ir, Cd has a relatively larger atomic radius due to its position in the d - block. But comparing the two sets, Na has a larger atomic radius than Cd.

Answer:

1. C. Na
2. B. Cd