Question

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 is: (i) s > p > d > f (ii) f > d > p > s (iii) p < d < s > f (iv) f > p > s > d NCERT Class XI Chemistry - Exemplar Problems Chapter 3. Classification of Elements and Periodicity in Properties

Answer 1

Hey there !

Solution:

According to orbital order, S orbital is closest to the nucleus followed by the P orbital, D orbital and finally the F orbital.

So According to the screening effect,

S orbital being close to the nucleus lacks screening from any other orbital as it is the first and the closest orbital. P orbital electrons are loosely bound with a greater size than s block elements as they undergo screening from S orbital electrons. Similarly D orbital electrons undergo screening from S and P block orbitals and finally F orbital also undergoes screening from All the other orbitals.

Hence the F block elements are generally big in size with less nuclear charge acting on their outermost electrons.

So the order of Screening effect is as follows:

S orbital > P orbital > D orbital > F orbital.

So Option ( 1 ) is correct.

Hope my answer helped !