In going down a group in the periodic table, what effect does electron shielding generally have on the effective nuclear charge acting on the outermost electron in an atom?

 Electron shielding has little effect on the effective nuclear charge because electrons are being added to principal energy levels, not to any inner levels. As the nuclear charge increases across a period, the effective nuclear charge acting on the outermost electrons increases.

Explanation:

answerto predict;

the objects have the same charge.