With respect to atomic structure, the atomic size increases down the group.
The distance between an atom's nucleus and its valence electrons is known as the atomic size of an atom, also known as the atomic radius. As one moves down the group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital. The atomic radius increases down a group. Protons are added moving down a group, but there is also addition of new energy shells of electrons. The new energy shells provide better shielding, allowing the valence electrons to experience only a minimal amount of the protons' positive charge.
With respect to atomic structure, the atomic size increases down the group.
To learn more about periodic table refer here
https://brainly.com/question/15987580
#SPJ9