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Q.

The element having highest ionization potential is

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a

H

b

He 

c

O 

d

N

answer is D.

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Detailed Solution

  • The amount of energy required to remove an electron for the  outermost shell of an element is called ionization potential.
  • Among the given options, Helium is small in size and also have full filled electronic configuration of 1s2. So Helium requires large amount of energy to remove an electron from its outermost shell when compared to other elements. 

 

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The element having highest ionization potential is