49

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