Which of the following elements has the largest atomic radii?

Lithium

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.