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## Homework Statement

Given Slater's expression for effective charge below, determine the effective charge experienced by the valence electrons of Sb.

## Homework Equations

*Z*

_{eff}= Z - 0.35a - 0.85b - cWhere

Z= the nuclear charge; a= the number of s and p electrons in the same shell; b= the number of s and p electrons in the shell one deeper; c= the remaining electrons

## The Attempt at a Solution

I have grouped the electron configuration as such:

[1s

^{2}] [2s

^{2}2p

^{6}] [3s

^{2}3p

^{6}] [3d

^{10}] [4s

^{2}4p

^{6}] [4d

^{10}] [5s

^{2}5p

^{3}]

Z

_{eff}= 51 - 0.35(4) - 0.85(18) - 28 = 6.3

Is this the correct interpretation? My course notes and the problem's formulation are ambiguous so that the 4d electrons could be construed as a factor of

*b*(× 0.85) or of

*c*(

*×*1).

Thank you for your help.