Research Notes I, 1949

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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.

20Ca 1s2 2s2 2p6 3s2 3p6 4s2 1s2 Zeff=20-0.35=19.65 20-1.70-7x0.35= 2s22p6 20-4.15=15.85 3s23p9 20-11.25=8.75 4s2 20-17.15=2.85 Sum of Zeff of diff shells =19.65+15.85+4/9X8.75+2.85/16 =39.57 Diamagntic conectim factor=2/3(1/137)2[?]Zeff =3.552x10-5[?]Zeff =1040x10-3 0.259 Haitrss value 1041x10-3 Thomas Ferris value 1073x10-3 Total Zff Z for [?K]=37.08

26Fe 1s2 2s2 3s2 3p6 3d6 4s2 1s2 2eff=26-0.35=25.65 2s22p6 26-4.15=21.85 3s23p6 26-11.25=14.75 3d6 26-18x1.00-5x0.35=6.35 4s2 26-10x1.00-14x0.85-0.35=26-22.25=3.75 Sum of Zeff=25.65+21.85+4/9x14.75+3/9x6.35+1/16x3.85 =56.19 amegnetic curectim=3.552x10-5x56.19=2.00x10-3 haitree value=2.02x10-3 thomas ferris value=2.46x10-3 0.259