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Q.

The element having highest ionization potential is

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a

$H$

b

$H e$

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 $1 s^{2}$ . So Helium requires large amount of energy to remove an electron from its outermost shell when compared to other elements.

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