The correct answer is option 2. Lithium.
The element with the largest atomic radius among the options provided is Lithium.
Atomic radius generally increases down a group in the periodic table and decreases across a period from left to right. Lithium is located at the top-left of the options given, and as we move down the group from lithium to beryllium, the atomic radius increases. Therefore, lithium has the largest atomic radius among these options. |