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Electronegativity is electron affinity and oxygen needs two electrons to fill an octet whereas nitrogen needs three. Nitrogen has a higher ionization energy than oxygen because it has a half filled p-orbitals and half filled orbitals are fairly stable. Remember that ionization energy is the energy of removing an electron and that electronegativity (or electron affinity) is how much an atom wants to gain electrons.
Yes oxygen is an exception because when you compare it with Nitrogen, Nitrogen is more stable because it has a half filled shell while oxygen has 2 unpaired electrons. Oxygen would be okay with losing an electron to become half full like nitrogen is while nitrogen is very stable with its shell half way filled and does not want to lose electrons. this is why oxygen does not follow the trend for ionization energy.
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