Question

how do the atomic size of elements vary as we move down a group

Answer 1

Answer:

hope it's correct

Explanation:

Atomic size increases down the group because of the addition of extra shells. So, as we move from group 1 to group 18 the size of the atom will decrease due to increased effective nuclear charge. And as we move from period 1 to period 7 the size will increase due to increase in shells.

Answer 2

Answer:

Atomic size increases as we go down a group because each time one new shell is added and electrons in the outermost shell move away from the nucleus.

Hope it helps!