Question

The atomic size increases down the group why ?

Answer 1

Answer:

hey here is your answer

The number of energy levels increases as you move down a group as the number of electrons increases. Each subsequent energy level is further from the nucleus than the last. ... The outermost electrons are repelled by the inner shell electrons (Screening effect) and hence, the atomic size increases.

hope it help you ☺️

Answer 2

Answer:

because the electrons in the atom are entering to new shell when we move down group