Question

The value of screening constant for an electron in 3s orbital is always identical with that of an e present in

Answer 1

The shielding constant for each group is formed as the sum of the following contributions:

All other electrons in the same group as the electron of interest shield to an extent of 0.35 nuclear charge units except 1s group, where the other electron contributes only 0.30.

If the group is of the [s, p] type, an amount of 0.85 from each electron (n-1) shell and an amount of 1.00 for each electron from (n-2) and lower shell.

If the group is of the [d] or [f] type then an amount of 1.00 for each electron from all lying left to that orbital.

Answer 2

Answer:

• The phenomenon occurs when the nucleus reduces its force of attraction on the valence electrons due to the presence of electrons in the inner shell. This is known as a screening effect.
• The shielding constant for each group is formed as the sum of the following contributions: An amount of 0.35 from each other electron within the same group except for the [1s] group, where the other electron contributes only 0.30.

Let us understand with the help of Cl [ chlorine] example

Cl : 1s² 2s² 2p⁶ 3s² 3p⁵

σ = [6*0.35] + [8*0.25] + 2*1

σ = 10.60

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• Learn more about screening effect

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