Question

atomic radius increases as you move down a group because______?
1)there are less energy levels
2)there are more energy levels
3)there are more valence electrons
4)there are more protons

Answer 1

2)there are more energy levels is the correct answer.

Answer 2

bcz there r more energy levels in which Valence electron remain constant.
as the energy level increases the attractive force of nucleus on electron decreases due to which repulsive force dominate over the nuclear force. so effective nuclear charge decreases, size increases