Why radii of Ar is greater than the radii of chlorine?

In chlorine, the radii mean the atomic or covalent radii which is actually half the intermolecular distance between 2 atoms whereas in Argon the radii means the Vander waals radii as Argon is not a diatomic molecule. Vander Waal’s radii are actually half the distance between adjacent molecule. So Vander Waal’s radii being larger than atomic radii, Argon has a larger radii than chlorine.

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