Oxygen possesses high IE than krypton, although "Kr" having the stable electronic configuration. This is due to:

Poor shielding effect in krypton

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Electron pair repulsion in krypton

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Large size of oxygen

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Very small size of oxygen respective of "Kr"

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Solution

The correct option is D Very small size of oxygen respective of "Kr"
$O ⟶ 1 s^{2} 2 s^{2} 2 p^{4}$
$K r ⟶ 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 p^{6}$
The size of $K r$ is bigger than oxygen due to which the $e^{-} s$ in oxygen are much closer to the nucleus due to which the effective nuclear charge is high and hence have high $I E$ than $K r$ .

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Oxygen possesses high IE than krypton, although "Kr" having the stable electronic configuration. This is due to:

The correct option is D Very small size of oxygen respective of "Kr"O⟶1s22s22p4Kr⟶1s22s22p63s23p64s23d104p6The size of Kr is bigger than oxygen due to which the e−s in oxygen are much closer to the nucleus due to which the effective nuclear charge is high and hence have high IE than Kr.