Question

What is Screening Effect ? Class 11th Chemistry

Answer 1

Answer:

Screening effect is the phenomenon that occurs when the nucleus reduces its force of attraction on valence electrons due to the presence of inner-shell electrons.

Explanation:

There are two distinct types of forces experienced by the outer electrons. The first being the attraction from the nucleus and the second being the repulsion from the inner electrons. Hence if the electrons between the nucleus and outer electrons increase, the attraction force of the nucleus decreases.

This is due to the increased fore of repulsion exerted by the many electrons present in the inner shell which dominates the attractive force of the nucleus.

Answer 2

Screening Effect is also known as the shielding effect.

Explanation:

• Screening Effect is defined as the reduction of the force of attraction of the nucleus upon the outermost valence electron due to inner shell electrons.

• The order of screening effect in the shells is s<p<d<f

• The outermost electrons has attraction force from nucleus and repulsive force from the inner shell electrons.

• It is also the  the reduction of the nuclear charge on the outermost electron cloud.
• The magnitude of the screening effect depends n the number of inner shell electrons.

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