11th Class Chemistry Chemical Bonding and Molecular Structure

  • question_answer 14) Define the bond length.


    It is defined as the average distance between the centres of the nuclei of the two bonded atoms in a molecule. It is usually expressed in angstrom unit \[(\overset{{}^\circ }{\mathop{\text{A}}}\,)\] or picometer (pm). It is measured by spectroscopic X-ray diffraction and electron diffraction techniques. The bond length in a covalent molecule AB is the sum of the covalent radius of the bonded atoms. Bond length = \[{{r}_{A}}+{{r}_{B}}\] The factors such as resonance, electronegativity, hybridization, steric effects, etc., affect the bond length.

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