In the case of the singlet on the top-right side of the panel in Fig. , the atomic character based on the energy is quite obvious. The energy equation includes the term K, which generally represents interatomic Coulomb interaction promoting atomicity, and -J, which is an exchange interaction term that tends to destabilize the singlet state and is not present in the wavefunction. The presence of K and -J without any direct dependence on the intraatomic Coulomb interaction term U indicates that this state is more likely to retain atomic characteristics rather than to form strong covalent or ionic bonds. Stronger atomicity in the graph aligns with this, as the energy expression supports a state where atoms remain relatively independent.