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NEETChemistryClassification of Elements and Periodicity in Properties

Why does oxygen have a smaller first ionization enthalpy compared to nitrogen?

Options

  1. AOxygen has more electrons.
  2. BOxygen has a smaller nucleus.
  3. COxygen has less shielding.
  4. DOxygen has greater electron-electron repulsion.

Correct answer

D. Oxygen has greater electron-electron repulsion.

Step-by-step solution

In the oxygen atom, two of the four 2p-electrons must occupy the same 2p-orbital, resulting in increased electron-electron repulsion, making it easier to remove an electron compared to nitrogen.

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