F2: KK (s2s)2 (s*2s)2 (s2pz)2 (p2px)2 (p2py)2 (p*2px)2 (p*2py)2
Thus, there is one s-bond in the molecule. Since all the electrons in the molecular orbitals are paired, it is diamagnetic. The single bond in the molecule is also in agreement with bond dissociation energy of 155 kJ mol-1 and bond length equal to 142 pm.
