Question

How does the atomic radius change going down and across the periodic table?

Answer 1

In general, atomic radius decreases across a period and increases down a group. Across a period, effective nuclear charge increases as electron shielding remains constant.

Step-by-step explanation:

Answer 2

Atomic radius increases as you move down and across to the left of the periodic table towards Francium. Atomic radius decrease going up and across to the right of the periodic table towards Fluorine.