Question

define covelnt radius?

Answer 1

covalent radius is the distance between the two in two internuclei separation between the nuclei of two single bonded atom

Answer 2

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 (pm) or angstroms (Å), with 1 Å = 100 pm. In principle, the sum of the two covalent radii should equal the covalent bond length between two atoms, R(AB) = r(A) + r(B).