The effective nuclear charge is defined as the net positive charge experienced by an electron in a polyelectronic atom. It can be calculated using the well-known Stars Rule.
Once I have calculated it for different chemical elements, I would like to know if there is (if there is any justification) any dependence between its value and the periodic property.
I remember hearing, for example, that the greater the value of the effective nuclear charge, the smaller the atomic radius (half the internuclear distance). And that the greater the effective nuclear charge, the greater the ionization potential.
However, I cannot justify these assumptions. Nor do I know whether this relationship exists in electronic affinity or electronegativity.