Chapter 6.9, Problem 6.9PSP

Interpretation Introduction

Interpretation:

The nitrogen-oxygen bond lengths in ${\text{NO}}_2^{-}$ are both 124pm and the bond distance between $\text{N-O}\text{and N=O}$ has to be compared.

Concept Introduction:

Bond length: It is defined as the average distance between nuclei of two bonded atoms in a molecule is called bond length.

The bond energy is directly proportional to the bond order and inversely proportional to the length.  The number of bonds increases the bond energy also increases.