down the group as the number of shells increase wont the effective nuclear charge increase because there would be more shielding effect in the atom ?
Dear Student,
Down the group, atomic size increases because now electrons are being added to higher larger shells. The effective nuclear charge increases slightly as we go down a group because the larger electron cores are less able to screen the outer orbitals from the nuclear charge. However, the small change in the effective nuclear charge could not counteract the increased size of the shell and so the size of the atom increases.
Down the group, atomic size increases because now electrons are being added to higher larger shells. The effective nuclear charge increases slightly as we go down a group because the larger electron cores are less able to screen the outer orbitals from the nuclear charge. However, the small change in the effective nuclear charge could not counteract the increased size of the shell and so the size of the atom increases.