Question
Define bond length.
Solution
Bond length: Bond length is defined as the equilibrium internuclear separation distance of the bonded atoms in a molecule. Each atom of the bonded pair contributes to the bond length.

In the case of a covalent bond, the contribution from each atom is called covalent radius of that atom.
The bond length in a covalent molecule AB
R = r A + r B
where R is the bond length; rAand rB are the covalent radii of atoms A and B respectively.

In the case of a covalent bond, the contribution from each atom is called covalent radius of that atom.
The bond length in a covalent molecule AB
R = r A + r B
where R is the bond length; rAand rB are the covalent radii of atoms A and B respectively.