To calculate the bond order and bond length of the nitrogen-oxygen bond in the nitrate ion NO3- , we first need to determine the resonance structures of the ion.Resonance structures of NO3-:1. O = N - O^- - O^- 2. O^- - N = O - O^- 3. O^- - O^- - N = OThere are three resonance structures for the nitrate ion, and each nitrogen-oxygen bond is a single bond in one structure and a double bond in another. To calculate the bond order, we can average the bond orders across the three resonance structures.Bond order = Total number of bonds in all resonance structures / Total number of resonance structures number of N-O bonds per structure Bond order = 1 + 2 + 1 / 3 1 = 4 / 3 1.33The bond order of the nitrogen-oxygen bond in the nitrate ion is approximately 1.33.Now, let's calculate the bond length. The bond length of a molecule is inversely proportional to the bond order. As the bond order increases, the bond length decreases. We can use the known bond lengths of single and double nitrogen-oxygen bonds to estimate the bond length in the nitrate ion.The average bond length of a single N-O bond is approximately 1.47 , and the average bond length of a double N=O bond is approximately 1.22 . We can use these values to estimate the bond length of the nitrogen-oxygen bond in the nitrate ion by taking a weighted average based on the bond order.Bond length NO3- 1.33 - 1 1.22 - 1.47 / 2 - 1 + 1.47 Bond length NO3- 0.33 -0.25 + 1.47 Bond length NO3- -0.0825 + 1.47 Bond length NO3- 1.3875 The bond length of the nitrogen-oxygen bond in the nitrate ion is approximately 1.39 .