The bond length may be defined as the average distance between the centres of nuclei of the two bonded atoms. It is expressed in angstrom (Å) units (1 Å = 10-8 cm) or pm (picometre) 1 pm = 10-10 cm.
In an ionic compound, bond length between two bonded atoms is obtained by adding up their ionic radii. Similarly, in a covalent- compound, bond length is obtained by adding up the covalent (atomic) radii of the two bonded atoms.
