Question

which element in period 2 has the greatest atomic radius?
options: na, li, c, be

Explanation:

Step1: Recall Period 2 elements

Period 2 elements are from Li (lithium) to Ne (neon). So first, identify which of the given options are in Period 2. Na is in Period 3, Li is in Period 2, C is in Period 2, Be is in Period 2.

Step2: Apply atomic radius trend

In a period, atomic radius decreases from left to right. So in Period 2, the leftmost element will have the largest atomic radius. Among Li, C, Be, Li is the leftmost in Period 2.

Answer:

Li (from the options, the correct element is Li, corresponding to the option with "Li")