Help in question 4.10

Bond length is defined as the equilibrium distance between the nuclei of two bonded atoms in a molecule.

Bondlengths are expressed in terms of Angstrom (10–10 m)or picometer

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

In anionic 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= rA + rB).

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