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Question

In a given shell, the order of screening effect is:
  1. s>p>f>d
  2. s>d>p>f
  3. s>p>d>f
  4. s<p<d<f


Solution

The correct option is C s>p>d>f
The order of screening effect of electrons of s,p,d and f orbitals of a given shell of an atom on its outer shell electrons s>p>d>f. For the same value of n, subshell that is more close to the nucleus has more penetrating power and the screening effect and the order of penetrating power is s>p>d>f. Hence s has the greatest effect to reduce the force of attraction between the outermost electron and nucleus due to its effective charge density followed by p, d and f in the same order.

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