Heteronuclear diatomic molecules 丌 p 02 P 丌 p co(ground state): 2 s KK(25)2(a25)2(2n)4(o2p)2 U s Is C Co 8Heteronuclear Diatomic Molecules 8 CO (ground state): KK（σ2s)2 （σ2s * )2 （π2p)4（σ 2p)2