The results of this work allow for assessing the consequence and prospects of the applied method for calculation the density derivatives for possible use in chemical predictions. The basic equation for the method (eq. 3) is an Ansatz that should be fulfilled due to our gradient theorem (eq.1) and nearsighted principle. However, it still needs theoretical and numerical confirmation e.g. by testing the factors possibly vital for the output: the B3LYP electron densities may be inadequate, the effective-core-potentials and corresponding nodeless pseudoorbitals, reducing the nuclear and core influences might also be considered.