Question

Diffrence between covalent radius and crystal radius

Answer 1

Ionic radius, rion, is the radius of an atom's ion in ionic crystals structure. Although neither atoms nor ions have sharp boundaries, they are sometimes treated as if they were hard spheres with radii such that the sum of ionic radii of the cation and anion gives the distance between the ions in a crystal lattice.
The covalent radius, rcov, is a measure of the size of an atom that forms part of one covalent bond.It is usually measured either in picometres or angstroms , with 1 Å = 100 pm.In principle, the sum of the two covalent radii should equal the covalent bond length between two atoms, R = r + r.