Ionization energy and Z effective

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fluidistic
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Homework Statement


Consider an alkali atom in its fundamental state and assume that its valence electron experiment a constant shielding with [itex]Z_{eff}>1[/itex]. Use the tabulated values of the ionization energy to estimate [itex]Z_{eff}[/itex] for the Li, Na and K atoms.


Homework Equations


I do not know.


The Attempt at a Solution


Z effective is the effective charge (in units of electron charge) the valence electron feels. I've "cheated" and checked out Z effective and the ionization energies for all these atoms, yet I do not find any correlation.
Ionization energies: (5.39, 5.14, 4.34) eV.
Z effective: (1.25, 1.84, 2.26).
I'm at a loss. Any tip is appreciated.
 

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