Question

The screening effect of $d-$electrons is:

• A. Equal to $p-$ electrons
• B. Much more than $p-$ electrons
• C. Same as $f-$ electrons
• D. Less than $p-$ electrons

Answer 1

The correct option is D Less than $p-$ electrons

More diffused is the shape of the orbitals poorer is the screening effect.

s- spherical shape
p- dumbbell
d- double dumbell
f- complex

Since s orbital is spherical in shape thus it is most penetrating.
Hence,the order of screening effect is $s>p>d>f$