Question

Why is the atomic radius of argon larger than that of chlorine?

Answer 1

The atomic radii of noble gases are by far the largest in their respective periods. This is due to the reason that noble gases have only Van der Waals radii as it does not form molecules while others have covalent radii. Van der Waal radii are larger than covalent radii. This is the reason for the radius of Argon being larger than Chlorine.