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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