# Chapter 7 - Periodic Properties of the Elements - Exercises: 7.16d

Slater's rules reflect more accurately the steady increase in $Z_{eff}$ as we move from left to right in a row in the periodic table.

#### Work Step by Step

The increase in $Z_{eff}$ from Si to Cl is $(6.12+)-(4.29+)=1.83$ According to the results in part a), the increase in $Z_{eff}$ is $(7+)-(4+)=3$ According to the results by Slater's rules, the increase in $Z_{eff}$ is $(6.1+)-(4.15+)=1.95$ Therefore, Slater's rules reflect more accurately the steady increase in $Z_{eff}$ as we move from left to right in a row in the periodic table.

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