Vander Wallace radius: Half of the distance between the two nuclei of the two nearest atoms of the two closest molecules that are closest to each other in the solid state of an element is called the Vander Wallace radius. Since the passage of atomic chambers results in covalent bonds , the radius of Vander Wallace is always larger than the covalent radius. For example, the values of the coherent radius of chlorine Vander Wallace radius are 0.99A and 1.80A respectively.