2. Consider an N₂ molecule in its first excited electronic state, that is, when an electron in the

highest occupied molecular orbital is promoted to the lowest unoccupied molecular orbital.

(a) Identify the molecular orbitals involved and sketch a diagram for the transition. (b)

Compare the bond order and bond length of N₂ with N₂, where the asterisk denotes the

excited molecule. (c) Is N₂ diamagnetic or paramagnetic? (d) When N₂ loses its excess

energy and converts to the ground state, it emits a photon of wavelength 470 nm, which

makes up part of the auroras lights. Calculate the energy difference in kJ/mol between these

levels.