Respuesta :
The largest atomic radius has Ba,because they are all metals of 2nd group,but as you know when you go down upright in the periodic table the metallic features getting stronger but also orbital layers increasing,and you can say more layers larger atomic radius.Hope I helped,sorry for English
Explanation:
When we move down a group then there occurs an increase in the size elements due to the addition of more number of electrons into new shells.
Hence, it means that atomic radius of the elements also increases.
For the given group 2A elements, beryllium is at the top so it has smaller atomic radius whereas barium is at the bottom.
Therefore, we can conclude that barium has the largest atomic radius.
