Additional symmetry for the electronic shell in its ground state and many-electron effects
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The additional symmetry for the properties related to the ground state of the atom is considered taking into account many-electron effects. Calculations of the I4f, I3d,I2p,I3p binding energies, 4fN-15d - 4fN system differences and 2p, 3p electron affinities in the second order of perturbation theory and in the configuration interaction approximation have been performed for the ground configurations with one open shell. The analysis of separate many-electron corrections for these quantities and their variation along the sequences of atoms and ions shows that the main corrections maintain the considered symmetry.
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