Of the elements calcium, ca, beryllium, be, barium, ba, and strontium, sr, which has the largest atomic radius? explain your answer in terms of trends in the periodic table.

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.

the answer is c. nacl