Question

Oxygen has lower ionization enthalpy. Give reaspn

Answer 1

Oxygen has outer electronic configuration:

2s2 2p4

Removal of one electron from the 2p subshell will make its configuration

2s2 2p3

thus it attains a half filled configuration.

Due to this it has low ionization energy.

Answer 2

Answer:

Oxygen has low ionisation energy (than that of nitrogen). It is due to an electron being added to an already half full orbital in oxygen, which results in electron electron repulsion, which will lower the ionisation energy. ... As Nitrogen is more stable, therefore it is much difficult to remove the valence electron.

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