Question

What do you mean by shielding and screening effect?

Answer 1

In a multielectron atom, the electrons present in the inner shells shield the electrons in the valence shell from the attraction of the nucleus or they act as a screen between the nucleus and these electrons. This is known as shedding effect or screening effect. As the screening effect increases, the effective nuclear charge decreases. Consequently, the force of attraction by the nucleus for the valence shell electrons decreases and hence the ionization enthalpy decreases.

Answer 2

Shielding effect is the reduction of effective nuclear charge on the electron cloud, due to a difference in the attraction forces of the electrons on the nucleus.

hope it helps u

and it can also be called screening effect