Are Hartree-Fock atoms too small or too large?
We address the simple question, whether Hartree-Fock atoms are smaller or larger than exact (Schrodinger) atoms. As a measure, we use . We study the ground state of the atoms He-Kr. The unrestricted Hartree-Fock method is used. To obtain the Schrodinger values we use the finite field CASPT2 approach, and the full CI scheme where possible. CASSCF calculations are also reported. Very large basis set