Question

What is shielding effect(or screening effect) ?

Answer 1

Shielding effect can be defined as a reduction in the effective nuclear charge on the electron cloud, due to a difference in the attraction forces of the electrons on the nucleus. It is also referred to as the screening effect (or) atomic shielding.

Answer 2

it is effect through which electrons are there in shell . For each atom there is different different shielding effect. Its sign is sigma