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.