Why we need covalent radius, crystal radius, wander wall radius ? Instead we have Neil's bohr equation
r=0.529n^2/z
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Bohr radius is only for finding out the radius of an energy level of unielectron species. It deals with the radius of an atom. When we talk of covalent radius, crystal radius and Vander waals radius we are talking about the molecular level of matter and not at the atomic level. Covalent radius is the distance between the center of the nuclei of the two bonding atoms (need not be same). Crystal radius is used to determine the distance between the nuclei of atoms of metals in a metallic crystal lattice. Van der Waals radius is used to determine distances between the bonding atoms in gases where the inter-molecular distances are very high.
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