Question

In which part of a group would you expect the elements to have

the largest atomic size?

Answer 1

1. In a group, the number of valence shell increases from top to bottom.
2. Let’s take the example of group $IA$ elements, the number of shells in $Li$ is one, in $Na$ there are $2$ shells, in $K$ there are $3$shells.
3. There are a maximum number of shells in the last element of the group, due to the increasing number of shells, the size of elements increases.
4. So, the elements at the bottom of a group will have the largest atomic size.