48

According to Slater (Phys. Rev. 36 (underlined), 57, 1930) the
screening effect is taken into account in such a way that
the SoP (?) electrons in (?) the same shell n are grouped
together to have same effective Z. Zeff
is different for d electrons with the same shell. The
(?) diamagnifism at nucleus can be obtained from the above
formula by summing the effective Z from all electrons
combined in the atoms.