I am aware that this question has already been asked here: Why does the "gap" between atomic radii get smaller down the periodic table?.
However, I was wondering if there is a way to answer this question using simple periodic trends instead of a formula to calculate atomic radius.
Since there is not only an s and p-block between Rb and Cs, but also a d-block, wouldn't the increase in shielding between Rb and Cs be higher than that of Na and K? Thus, shouldn't Rb and Cs have a larger difference in atomic radii?
I got this question in my chemistry class while learning about periodic trends, and it apparently also appeared on the 1993 AP Exam, so I would think that this problem could be explained using simple periodic trends.