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Analytic Hartree-Fock calculations have been carried out for the lowest neutral atom 3d^n-24s² states of Ti through Zn. Except for Cr and Cu, these calculations are for the neutral atom ground states. The results are compared with the earlier 3dⁿ state calculations. It is observed that the $4s$ electrons have little effect on the $3d$ and inner shells.
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R. E. Watson (1960) studied this question.
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