The electronic configuration of Li2 molecule is σ1s2,σ*1s2,σ2s2 The configuration states that

Lithium molecule (Li2) The electronic configuration of lithium is 1s22s1. There are six electrons in Li2. The electronic, configuration of Li2molecule, therefore, isLi2=(σls)2(σ*1s)2·(σ2s)2From the electronic configuration of Li2 molecule it is clear that there are four electrons present in bonding molecular orbitals and two electrons present in antibonding molecular orbitals,Its bond order, therefore, is 1 / 2(4-2)=1.It means that Li2 molecule is stable and since has no unpaired electrons. It should be diamagnetic. Indeed diamagnetic Li2 molecules are known to exist in vapour phase.