the result has been explored to quantify inductive and resonance effects. The new perspective for discerning atoms in the CDFT formalism has been opened by exploration of the Hellman-Feynman (H-F) forces on the nuclei. In the absence of external fields other that from atomic nuclei, the disturbance in the external potential   R . Energy derivatives over displacement of nuclei i R in these representations have fundamental physical meaning of force, force constant, and anharmonicities associated with displacement of atomic nuclei. They all describe directly properties of atoms bound within the system and characterize atomic contacts. Since forces are entirely determined by the electron density function, there is no need to artificially condensing any local quantities for determination properties of individual atoms.