The bonding atomic radius of the atom a is d1/ d2.
Atomic radius:
The atomic radius of a chemical element is a measure of the size of its atom, usually the mean or typical distance from the center of the nucleus to the outermost isolated electron.
When a covalent bond is present between two atoms, the covalent radius can be determined. When two atoms of the same element are covalently bonded, the radius of each atom will be half the distance between two nuclei because they equally attract the electrons.
The bonding atomic radius of the atom :
a = d1/ d2
d 1 and d2 is the bond length.
Therefore the relation between atomic radius is a = d1/d2
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