Molecular orbital theory 2

http://www.chem.ucla.edu/~cantrill/30A_F05/Diborane.pdf in hetero diatomic molecules there is no longer an energy match between the atomic orbitals.electronegativityThe power of an atom ( in a compound) to attract electrons.dipole momentThe physical result of unequal sharing of an electron pair.LUMO lowest unoccupied molecular orbitalHOMOhighest occupied molecular orbitalisoelectronic speciesTwo species are isoelectronic if they possess the same total number of electrons.isostructural speciesTwo species are isostructural if they have the same structures