Final answer:
Magnesium (Mg) has a larger atomic radius compared to Chlorine (CT).
Step-by-step explanation:
The element with the larger atomic radius in this case would be Magnesium (Mg). Atomic radius refers to the size of the atoms, and it generally increases as you move down a group or column in the periodic table. Magnesium is located to the left of chlorine in the periodic table and therefore has a larger atomic radius.