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Bond order is the number of chemical bonds between a pair of atoms. It is an index of the strength of a chemical bond. Bond energy, also known as bond dissociation energy, is the amount of energy required to break one mole of bonds between two atoms in their most stable form (gas phase). It is a measure of the strength of a chemical bond. Bond length is the distance between the nuclei of two bonded atoms in a molecule. The bond length affects the bond strength as shorter bond lengths generally correspond to stronger bonds.

There is a correlation between these three quantities: - As bond order increases, bond energy increases, and bond length decreases. This is because the higher bond order means more electrons are shared between atoms, leading to stronger bonds. - Conversely, when bond order decreases, bond energy decreases, and bond length increases, forming weaker bonds.

Bond lengths can be experimentally measured using various techniques such as X-ray diffraction, electron diffraction, and microwave spectroscopy. Bond energies can be measured indirectly by determining the overall energy change (enthalpy change) in a reaction where the bond is broken and comparing it with known bond energies. Bond order can be calculated but sometimes can also be experimentally determined indirectly. For simple molecules like diatomic molecules, bond order can be found directly from molecular orbital theory, which describes the behavior of electrons in a molecule. In more complex molecules, bond order can be estimated using various methods, such as comparisons to other known bond orders or resonance structures. However, in some cases, it is difficult to assign a bond order to the bond between given atoms.