Ncert Exercises & Solutions

4.10 Define the bond length.

Bond length is defined as the equilibrium distance between the nuclei of two bonded atoms

in a molecule.

Bond lengths are expressed in terms of Angstrom (10^–10 m) or picometer

(10^–12 m) and are measured by spectroscopic X-ray diffractions and electron-diffraction

techniques.

In an ionic compound, the bond length is the sum of the ionic radii of the constituting

atoms (d = $r_{+} + r_{-}$ ). In a covalent compound, it is the sum of their covalent radii (d = $r_{A} + r_{B}$ )