Q.
In a given shell the order of screening effect is
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WBJEEWBJEE 2008Classification of Elements and Periodicity in Properties
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Solution:
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.