1) can bond order be a negative value?

2) for the h2+ molecule, absorption of light can cause an electron to be promoted from the
σg to the σu* orbital. the equilibrium bond length for the resulting excited molecule will
be

a) shorter than for h2+ in the ground state.
b) longer than for h2+ in the ground state.
c) equal to that for h2+ in the ground state.
d) none of the above. the molecule is not stable and the will fall apart.