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Detailed calculations show that the value of Z_{eff} for the outermost electrons in Na and K atoms is 2.51+ and 3.49+ , respectively.

What value do you estimate for Z_{eff} experienced by the outermost electron in both Na and K by assuming core electrons contribute 1.00 and valence electrons contribute 0.00 to the screening constant? What values do you estimate for Z_{eff} using Slater’s rules?

Does either method of approximation account for the gradual increase in Z_{eff} that occurs upon moving down a group?

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