Question

oxygen has lower ionization enthalpy than nitrogen explain why

Answer 1

because the number of proton in oxygen will be more than the nitrogen so the number of proton keep the electrons to very strictly with the own(proton) . where is in nitrogen the number of proton is less than the oxygen therefore the electrons can a easily ionise (can go with another elements) therefore their ionization enthalpy will be less than the oxygen but oxygens electrons will want more energy to have a inonise therefor oxygen enthalpy will be more than the nitrogen.
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Answer 2

Answer:

(1) The electronic configuration of nitrogen (N, Z = 7) is 1s², 2s², 2p³ and that of oxygen (O, Z=8) is 1s², 2s² 2p^4.

(2) Nitrogen atom acquires extra stability due to half- filled 2p-orbitals while oxygen can acquire half-filled orbital and extra stability by losing one electron. Thus, oxygen can easily lose one electron.

(3) Nitrogen requires more energy to remove an electron due to extra stability. Therefore, first ionisation enthalpy of oxygen is less than that of nitrogen.