What does shielding effect mean in chemistry?

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Mar 6, 2017

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In a multi electron atom, the electrons of the valence shell(outermost shell) are attracted towards the nucleus and also these electrons are repelled by the electrons present in the inner shells.

On account of this, the actual force of attraction between the nucleus and the valency electrons is somewhat decreased by the repulsive forces acting in opposite direction.

This decrease in the force of attraction exerted by the nucleus on the valency electrons due to the presence of electrons in the inner shells, is called screening effect or shielding effect.

The magnitude of the screening effect depends upon the number of inner electrons ,i.e., higher the number of inner electrons, greater shall be the value of the screening effect.

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