Discussion Forum : Periodic Classification Of Elements
Question - For a given value of n (principal quantum number), ionization enthalpy is highest for
Options:
A .  d - electrons 
B .  f - electron
C .  p - electron 
D .  s - electron
Answer: Option D
:
D
For a given shell,the penetration power of a subshell decreases from s to f, s > p > d > f.
Higher the penetration power, higher is the energy required to remove an electron.

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