At the outset, we take a multiparticle view of the chemical bond and implement a special method EDABI (Exact Diagonalization Ab Initio approach) devised in our group earlier and apply it here to a rigorous analysis in the simplest situation of the H 2 molecule. The generic case of the H 2 molecule involves twoelectron single bond and thus the role of interelectronic correlations in combination with concomitant single-particle wave function readjustment in the resultant (correlated) state, can be analyzed rigorously and in mathematically analytic terms.