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Ionization energy increases across a table because the valence shell of the elements as you go towards the right is nearly filled whereas as, as you go towards the left, the electrons have a low ionization energy from their willingness to lose electrons and become cations which is why Oxygen has a lower ionization energy than Nitrogen.
The fourth valence electron in oxygen's p orbitals has a lower ionization energy because of the electron electron repulsion formed by the lower three valence electrons. This ionization energy is lower than nitrogen because of the three parallel electrons in nitrogen's p orbitals.
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