Fersman's idea of energy coefficients (shares) of cation and anion constituents of minerals is modified within the framework of minerals atom kernels and binding electrons crystal chemistry, in accordance to which the energy of atom kernels and electrons binding that determines mineral properties, is calculated through summation of their energy coefficients. The work presents a modified and extended periodic system of chemical elements atom kernels energy coefficients. Physical essence of atom kernels energy coefficients is disclosed for the first time as cumulative ionization potential of their formation from free neutral atoms.