shielding effect increases from left to right in a period of periodic table.how? i have read it in a book?

Question

i mean this statement

Answer 1

In multielectron atoms the outermost electrons are shielded or we say they are screened from the nucleus from inner electrons.This is known as screening effect.So the electrons which are very closer to the nucleus experience greater attraction towards the nucelus than outermost electrons.As aresult the outermost electrons do not feel the full charge of the nucleus.If the number of inner electrons in the inner shell is large the screening effect will be large.thus shielding effect increases from left to right.

Answer 2

Shielding does not increase from left to right - it stays more or less exactly the same, because the added electrons are always going in an outer level, and not an inner one..
It does, however, increase as you go down a group, because there are more and more complete inner levels of electrons.

Answer 3

Shielding of what?