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 and then calculate the average bond order.Resonance structures of NO3- ion: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 combination of a single bond and a double bond. To calculate the average bond order, we can use the following formula:Bond order = Total number of bonds in all resonance structures / Total number of resonance structures * Total number of bonds in one resonance structure In the nitrate ion, there are a total of 6 bonds 2 single bonds and 1 double bond in each resonance structure .Bond order = 6 / 3 * 2 = 1The average bond order for the nitrogen-oxygen bond in the nitrate ion is 1.Now, let's calculate the bond length. The bond length of a single bond N-O is approximately 1.47 , and the bond length of a double bond N=O is approximately 1.22 . Since the bond order is 1, the nitrogen-oxygen bond in the nitrate ion is a combination of a single bond and a double bond. Therefore, the bond length will be between the single bond and double bond lengths.We can estimate the bond length using the following formula:Bond length = Single bond length + Double bond length / 2Bond length = 1.47 + 1.22 / 2 = 1.345 The bond length of the nitrogen-oxygen bond in the nitrate ion NO3- is approximately 1.345 .