Question

In a given shell the order of screening effect is

• A. $ ~s\text{ }>\text{ }p\text{ }>\text{ }d\text{ }>\text{ }f $
• B. $ 5\text{ }>\text{ }p\text{ }>\text{ }f\text{ }>\text{ }d $
• C. $ f\text{ }>d>\text{ }p>s $
• D. $ s\text{ }<\text{ }p\text{ }<\text{ }d\text{ }<\text{ }f $

Answer 1

Answer: (A)

The relative extent to which the various orbitals penetrate the electron clouds of other orbitals is $s > p >d>f$. Electron will experience the greatest effective nuclear charge when in $s$-orbital, then a $p$-orbital and so on. Ionisation energy increases with an increase in penetration power and thus, the order of screening effect is $s > p>d>f$.