Question : The ionisation energy of nitrogen is greater than that of oxygen because nitrogen has:
Option 1: high bond dissociation energy
Option 2: smaller atomic radius
Option 3: half-filled P-orbitals
Option 4: high nuclear charge
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Correct Answer: half-filled P-orbitals
Solution : The correct option is half-filled P-orbitals.
Nitrogen, with its atomic number 7, has an electron configuration of 1s² 2s² 2p³. This means it has three electrons in its p-orbitals. The p-orbitals can hold a maximum of six electrons, and having three electrons in the p-orbitals results in them being half-filled. This half-filled configuration provides additional stability to the nitrogen atom, which contributes to its higher ionization energy compared to oxygen.
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