Why does Oxygen have a lower first ionization energy then nitrogen?

Explain why the first ionization energy of oxygen, 1314kJ mol^-1 is less than that of nitrogen, 1402kJ mol^-1?

  • Why is it against the expected trend?

  • Answer:

    I think it is due to the repulsion between electrons. More the no. of electrons, more will be the repulsion

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due to higher electronegativity of oxygen atom

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